About an hour and a half ago Midway (from Wikiarms) had these (they're all gone now but you could have bought 10 boxes at the time):
- [$0.07/rd] CCI Mini-Mag High Velocity Ammunition 22 Long Rifle 36 Grain Plated Lead Hollow Point Box of 100http://www.wikiarms.com/go/3192
I know that's no help now but if you sign up on http://www.wikiarms.com/
you can get almost real-time alerts. If you happen to be available at the time they come in you can usually purchase some.
I think 7c per round for MiniMags is a pretty good price. Shipping will bring it up a cent or two per round, depending on how much you buy. I've had quite a lot of success picking up 22LR via WikiArms. Sorry I didn't see it earlier—I might have caught you while they still had some.