I also just built my first Dino set. It was the small Raptor Ambush set, and I got it for around $6.xx during Walmarts clearances.
Let me say that I am hooked on it. It was a sweet little set and I want to get more but obviously, they are all gone now! I may have to look on bricklink and ebay to get some more.
Completed Game Tab: 2013
"Fire Chaos Style, Kitchen Fist uber secret move! Hot Hot Sensitive Tongue Slash! Kiiiiiaaaaahhhhh!"
- Mr. Champloo Disgaea 3