What's weird about jerseys, is that their all made of 100% polyester, so whether you buy a $120 jersey or a $15 one from Walmart or Target they will work the same, unless you need the rear pocket. So save your money from buying expensive jerseys for really nice biking shorts.
Right now due to end of the season closeouts you can get great deals on clothes at:
Find Short Sleeve Cycling Jerseys: The Best Men's Cycling Clothing From Performance Bike
Or:
Short Sleeve Cycling Jerseys: Warm Weather Bike Jerseys: Nashbar
The problem with most cycling specific jersey's is that their tight fitting, the ones at Walmart and Target are not, though they do sell some that are. I like loose fitting jerseys especially the hotter it is, the looser jersey allows air to bellow between the skin and the cloth making you cooler then a tight fitting one. I posted the above sites just in case you were looking for something a bit different.