You could also use one of those "Seal-a-meal" type of machines. They have bags that are pretty good size and on a roll. They will wrap and kind of suck all the air out too, so they will be similar to the shrink wrap. I don't really know how the cost would compare to the shrink wrap, but it will give you one more option to look into. The plastic that is used may be a little thicker and stronger too.
Let us know how you do! Sheila