food grade bags for 4 gallon buckets

I was able to find food-grade bags that fit inside 4 gallon buckets. They come up at least six inches, so they might work out for a 5 gallon bucket. I ordered them from Murray McMurray Hatchery - they're freezer bags for turkeys. With shipping, the cost came to about 50 cents per bag. The only other option I could find was in Salem through a Bosch dealer. Those bags were $1 per bag.