Walmart.com has 12pk 60g Gator Grit hook-and-loop sanding discs for $1.06. Free store pickup.
For some reason, min quantity is 2, and I'm unable to do same-day pickup even though Brickseek shows my local store having stock. But it appears available for site-to-store for arrival in about a week.
I just picked up my order from the last time this was in stock. I ordered two packs, but they mistakenly sent me a 60 and an 80. It didn't bother me because it'll take me forever to even go through one pack of 60, but be sure to check your orders just in case.