Wendsy, let me know if mine had postage due. I took reg size envelopes as well as legal size to my local post office. They both were 45 cents. Then I took finished blocks in a legal size envelope as well as some in larger manilla envelopes Both were 85 cents. I wasn't told they can charge more somewhere down the line! I guess my experiment was useless. I hope nobody gets charged extra, and if you do please let me know!