You can't really get any new, descent quality bike for any specialty for $250. Probably best to go on CL and get a used bike. Definitely DO NOT go to big5, walmart, target, etc. (just any big store) to get a bike; go to a LBS, they'll probably let you test ride a few bikes and you will feel why they cost a few hundred dollars more.

http://www.bikesdirect.com/products/trackbikes.htm
^Windsor Hour. It's OK, but it's $280 ATM and is the cheapest track bike on there website.