There are a couple different kinds of Three Wheelers, Recumbents, and Recumbent Trikes.
There are performance trikes and recumbents that are designed for going longer distances and have the same features as a performance road bike. These bikes are fast and fun with a comfortable recumbent pedaling position. These start at about $800
There are traditional Adult Trikes that have no speeds or three speeds with a hand brake or coaster brake. These start at about $425