Pop Secret popcorn (3-ct box) is currently on a buy one at $2.29, get one free sale. On top of this sale, you can use the $1/2 coupon available here: IE or Firefox. Final cost just $0.65 per box! *Sources tell me $1/2 blinkies just went up at some other grocery stores, so keep your eyes open!
Also these are on sale at Albertsons this week. If you spend $10 you get $3 off. They are on sale 10 for $10, so it makes them .70 cents each. With the above mention coupons they will be .20 cents each.