How much would it cost me to make a fleece blanket?

Fleece can be anywhere from 7 to 15 dollars or per per yard. You will need 4 yards to make the blanket you described. The kits are generally more, BUT, Joann usually has some 40 and 50% off coupons that you could use to make the kits more affordable. You could also use the coupons on the cut fabric for that matter...