Looking at your wants from your other post, and given the current market, your not going to find those titles easily, each goes for $50-$150 right now, (in the world of e-bay and resellers any more) if the members here have any they might cut you more of deal. (i've been in the mareket for them too)
Your Turbo Duo will play all the american releases as well as the Japaneese CD's as they were not region protected however, some may not work, there are few exceptions. (like games that require an arcade card)
My suggestions, There is a ton of cool games that don't get much attention for the TG-16, or are reasonably priced and easy to get your hands on. Try some of these:
Fighting Street
Final Lap Twin
Blazing Lazers
Sidearms
Legendary Axe
Aero Blasters
Ninja Spirit
Pac Land
Splash Lake
And so many more,
Also try these videos for Great Game Reviews
www.turboviews.com also all on youtube under turboviews.
Oh and welcome.
as and edit: seriously listen to everyone like vestcoat, arkhan, firbomber, HercTNT, 420goat. sorry if i left anyone out who's been here a while and really helped me out. I've learned a lot about the TG and PCE stuff just from thier posts, you can also get a lot of info by asking too.