When DQ first opened, you could buy the parts for the toy you had made on the Sid's Create-a-Toy game. If I remember correctly, it was about ten dollars for the parts--you assembled it yourself. I haven't been in a while, but I assume that's what you're referring to, and I don't know if the price has changed (I'd imagine it probably has), but that's the only thing I could think of.
The toys themselves depended on what you made--they had pieces of all kinds of stuff--baby dolls, robots, dinosaurs, skeletons, even truck wheels. You could just make the toy standard, or put a baby doll head on a dinosaur body with wheels for legs! It's actually a lot of fun, and you don't have to buy the toy at the end--they may not even offer the option anymore, but if they do, that's what I remember.
Hope this helps!