I just came back from Costco, where I found a table piled with Coolmax shirts for $15. They have a stand collar, half zip, longer cut back, and a zip pocket at the rear hem. They aren't labeled as bike jerseys but they sure as heck look close enough to me! The fit would be a little looser than most jerseys, but definitely closer than a t-shirt. Good enough for me!
These were in with the men's clothing (thought I'd clarify there ), and they had Small up to 2XL. Colours were pretty bright - blue, green, red, with black sleeves; also some grey w/black sleeves and all-black, but unless you are a ninja cyclist, those might not be too useful.
Thought I'd pass it along in case there were Canadian Costco members here... The Boy has had shirts of this brand before and they stand up really well. Be warned that they do get pretty niffy if you don't wash them immediately, though.