do this: go by the post office and get one of each of the larger flat rate boxes they carry. See how many will fit into each, weigh it, and if less that 70 pounds it will be the flat rate. Whichever most efficiently can send the most, box em, and put them for sale for the amount of postage. When sold, print a label and the post office will pick it up with a call. This way, they won't go to waste. I have stacks of old mags, they make great reading.