eBay

Have a bunch of puzzles and games I wish to sell. Have access to boxes that are 16.5"by 16.5" by 2" that the items will fit into. What would be the best option to ship them. Don't think the weight will be over 3 pounds. Any ideas would be appreciated...

Does anyone know if you use a pizza box as a shipping container how much the USPS will charge? The square inches of the box is higher that a "small" USPS flat rate box but smaller than a "medium" flat rate bo.