GanderMountain.com has the Winchester .22 LR 333 Bulk Pack on sale for $12.
99.
To get 2664 rounds for $83.92 shipped:
First, add 8 packs to your cart for $103.92
Product Link!: http://www.gandermountain.com/modperl/product/details.cgi?i=419
Then, add promotion code GM1WL25 at checkout to get $20 off.
Comes out to be about 0.0315 cents/round.