Seller sent package with a $5.98 postage due charge, due to putting a trading card into a solid block protector. This took the package out of the first class mail category and moved it into the small package category, because the thickness of the "envelope" was too great to go through the normal letter processing equipment. Luckily, this did not cause the contents to be ripped/squeezed out (which has happen to me more than once). Sellers need to know how to package items correctly.