i got my blks today...& a big bill. I did only 12 blks., & sent them 1st class postage..enclosing my mailing label & postage. I got a priority pkg. with 6 cents of postage on it & a bill for $4.84. Now at my P.O. they will not accept this type of mail UNLESS it has the correct postage on it at the mailing...& there must be a return address on it..this pkg did not have a return address on it, or it would have been sent back to sender. I seldom moan & groan over peoples mistakes, but this was much to big an error to overlook. There was enough of us swapping that we all should not have got duplicates, & I got several duplicates, guess I won't do this swap again.