I need CR 2032 batteries occasionally, for bike computers and lights. My drugstore wants US$7.50 each, and WalMart wants $6.40. However, WM also sells bike taillights for ~ $6.99 that contain 2 of the CR 2032 batteries. The taillights are basic, steady and flash mode only, but are decent and have the rubber loop "bracket" that attaches easily to a seatpost, etc. Not bad.

Not sure how good the quality of the batteries are. Same with the online ones I've bought - they may be counterfeit or outdated, dunno, but they sure are cheap, with free shipping (just be prepared to wait a week or more). If you want the batteries in a hurry, you can get them with the free taillight attached.