One of my favorite artists,  kazen101 has lately been offering low-priced sketches on his stream. As you might be able to tell from my gallery, I've been jumping on these offerings and getting a ton of really good depictions of my characters for cheap! I HIGHLY recommend you hop on down to his FA page and take advantage of his offerings. He still has lots of slots open for regular commissions and his streams.

Some examples of the $15 I've gotten from him:
http://www.furaffinity.net/view/19025876/
http://www.furaffinity.net/view/19213279/
http://www.furaffinity.net/view/18909433/

And his more advanced Full Page Sketches ($25) and Digitally Shaded Sketches ($35)
http://www.furaffinity.net/view/19108132/
http://www.furaffinity.net/view/19135298/

And definitely check out his stream, where you can get one of these sketches live!
https://www.tigerdile.com/stream/kazenstream/