For gamingjustin,
I bought one of those USA region Bios version NEC produced Turbo Duo consoles back in November 1994 brand new for a mere $99.99 USD + tax and it was the very last one in stock! I still have it to this very day and it works like a charm without any problems whatsoever...built very solidly by the famous NEC folks in Japan. ^_~
Back in for the entire year of 1994 and into 1995, U.S. retail stores were heavily discounting their Turbo Grafx-16 and Turbo Duo hardware + software to make more space for the competition (Super Nintendo & Sega Genesis). So if you were to walk into a U.S. based Toys-R-Us store back in 1994, one would see a bunch of cheap-ass TG-16 & Duo software in the range of $14.99-$19.99 USD...quite a bargin back in those days.
Even the very last Turbo Duo Hu-Card software title by the name of "Magical Chase" was priced at a paltry $19.99 at TRU stores across the USA back in 1994 -- it is regarded as the very last TTI (Turbo Technologies Incorporated) produced USA Hu-Card based cartridge to be released for the American Turbo Grafx-16/Turbo Duo platforms -- hence, it's very rare and HTF even today -- it commands a hefty secondary video game cartridge collector's ransom for one...$250.00 USD for one with original instruction manual but no original TTI factory cardboard box is the norm these days. ^_~
And even if you get a PC Engine console of any iteration, it would still have to be internally modified to use with the Hu-Card convertor to play those USA region Hu-Cards anyways. But if you go with either a USA NEC produced Turbo Grafx-16 or Turbo Duo, one would only need to pick up a Hu-Card convertor such as the boxy "Mirai" version or the rare Kisado convertor to play those cool Japanese Hu-Card cartridges. Be prepared to pay upwards of $100.00-$200.00+ USD for a either a boxy "Mirai" or the even rarer "Kisado" Hu-Card convertor though... ^_~
The USA based TG-16's CD-Rom2 interface (in conjunction with either a Super System 2.0 or Arcade Card Pro upgrade) can play those cool Japanese CD-Rom2, Super CD-Rom2 or Arcade CD-Rom2 game titles (only if you have the Arcade Pro upgrade is that possible to play the properity based Arcade CD-Rom2 based titles, otherwise, one would only be able to play with just the regular CD-Rom2 or Super CD-Rom2 formats with a Super System Card 2.0 upgrade on a Japanese PC Engine Duo console).
The USA Turbo Duo already comes with Super System Card 3.0 upgrade and will play the earlier mentioned CD-Rom2 + Super CD-Rom2 based game titles in USA or Japanese formats without the need for any convertor needed. (Same goes for the PC Engine Duos as well, they can play those USA based Super CD-Rom2 game titles without any problems). ^_~
One would have to just pick up an Arcade Duo Hu-Card upgrade to play those cool Arcade CD-Rom2 titles like 'Ginga Fukei Densetsu Sapphire' (aka 'Galaxy Space Police Woman Sapphire' in English -- the only shmup title released on that expensive format) on a USA Turbo Duo console.
It's recommended to pick up a NEC produced Tennoekoe Bank Rom-Ram Hu-Card to save your various PCE game saves for posterity as the internal PC Engine Duo/Turbo Duo's memory manager will lose the stored game saves if not powered up regularly (every two weeks or so) because of the internal capacitor's losing it's charge to save the high scores & game save states. Or the other alternative to pick up a PC Engine Duo Memory Base 128 to save your PCE game saves and high scores with double 'AA' batteries to power it up upon powering the Duo console for the night. ^_~
It is recommended that you pick up a solid PCE joystick controller if you plan to spend some serious gameplay time with the many various PCE shmup titles -- an NEC produced TG-16 "Turbo Stick" arcade stick is an excellent controller for the little $$$ you pay down for one.
Or if $$$ is no object with you, then I'd recommend the rare Hori produced "Fighting Stick PC" arcade stick that was produced in extremely limited numbers for the Japanese PC Engine Duo console market in Japan and was priced at a hefty 7,800 yen MSRP back in 1995-1996! It features a solid all-metal joystick base along with a 8-way digital-based Seimitsu arcade joystick and 6-button "fighting style" layout + built-in slow motion capability & two levels of adjustable auto-firing rates (to fine tune to your gaming tastes). It is regarded as one of the best arcade sticks I have ever used for the PC Engine Duo platform (and will even work on a PC Engine console or even the USA Turbo Grafx-16 consoles with a reverse Duo to PCE controller adapter cable) and is a world-class Japanese arcade stick bar none! I, personally, find my PCE shmup titles scores getting higher if I use this particular Hori 'Fighting Stick PC' arcade stick setup... ^_~
Turbo Zone Direct (based in Southern California, Agoura Hills, to be exact) still sells "brand new" USA Turbo Grafx-16 and Turbo Duo software titles + hardware accessories...it's website address is:
http://www.tzd.com
PC Engine Fan X! ^_~