Walmart has Cool Whip (8oz containers) on rollback for just 97 cents each. Use this $1.00 off two KRAFT COOL WHIP Whipped Toppings printable coupon to pay just 47 cents each when you buy one. Cool Whip freezes just fine by the way. You could probably find Cool Whip for a similar price when on sale at a grocery store near you.
You can check out other Walmart deals here.