You can find both recumbent bikes and trikes at the "Used Bike Shop" in Lincoln. It is on North 66 st. Dont let the name of the shop put you off, Denny had new bents too. He is a Bacchetta and TerraTrike dealer, and has several in stock, also used ones. Good guy to do business with.

Depending on what brand you want, Cycle works in Lincoln is a Rans dealer, but generally dont have any in stock,and Xtreme Wheels in Council Bluffs is a great bent dealer. Also it has been several years since I was there but there was a bent dealer in GI. I dont remember what brand they carry, or if they are even open anymore.