I found a place kinda near here that sells chicks for $2 and silkie chicks for $5. The regular chicks are the result of nature just kinda happening and the chickens I got aren't really a specific breed. He could tell me the color of the egg they came out of, but that's about it. I guess it really comes down to how specific you want things with your chickens, where more specific is more costly. I wanted some decent layers and a variety of colors and builds, so I got exactly what I wanted really cheaply.
That being said, $11.50 does sound a bit high, but it depends on what your purposes are. If you are wanting to fill out a full flock of these, that's going to get expensive fast and I'd probably go a different direction with this. But adding one or two to get a little variety in your yard doesn't sound too rough on the budget.