everybody is having sales.
www.REI.com www.nashbar.com www.performancebike.com
The difference between bike gear and regular gear at walmart is fit to the body so as not to create extra wind drag, Sleeves tight to wrist again to keep air from filling them, long in the back and contoured up in the front so that when on the bike it covers your butt to keep rain or cold air at bay not running in at the waist band. Often you will find a draw sting at the bottom to keep it snug. Also a pocket on the back for gear. Vented back or pits for a fall jacket zipping it down in the front will allow air to circulate and vent out the back or the pits.
I just picked up a Sugoi jacket at Nashbar for $30 on sale. Pretty happy with it. Beats my regular windbreaker and keeps the sweat evaporating. Works for me with a short sleeve jersey in the high 40's to low 60's I'm seeing in Atlanta now.