If you want thinner, I like the three pack at Walmart in the craft section. The best thing is they have a peel off backiing and have adhesive so You don't have to figure out how to get them to stick. And they cut very easily. I also use the vent covers, but went back to Walmarts brand since they were more convenient.
S2S2015 Challenge $ 19.22 updated 7/24/2015