I shoot ~500rds 3 times a month for steel challenge matches. It sucks trying to find ammo. Sometimes the only option is to pay $35-40 for a brick, whether that be from resellers or online retailers charging an arm and leg for shipping. That being said, I have had an order from sportmansoutdoor for 5,000 rounds of eley ammo since December and it still has not shipped... Nor have I seen Blazer bulk since February online anywhere. Something has got to change.
You should follow slickguns.com or the S&W forum link. I have bought almost 9000 rounds this week for .04 to .05 cents a round shipped. I would suggest opening up a cabelas CC account and you will get 5.00 flat rate shipping on every ammo order.
http://smith-wessonforum.com/smith-wesson-m-p-15-22/292430-official-stock-22lr-ammo-thread-142.html
http://www.slickguns.com/