I dont think you will be able to get one for that price at a LBS, a place like bikesdirect as was suggested is probably your best bet, but so far as a shop in Philadelphia that could be of assistance try 'Bicyclerevolutions' (www.bicyclerevolutions.com), great shop, wealth of knowledge..."check out their blog, yo", I dont know if they can work within your specified budget tho, cant hurt to see what they have on offer, you never know.

If newbies arent welcome around here with their obvious questions (because there is a promise that they will have 'obvious' questions), why not switch the ability to join the forum off?