how much postage fro 6x8 envelope
The postage rate to mail a 6x8 envelope in the United States as of  2014 is $0.44 if it is within the regulated weight.he cost of postage for a 6x8 card if it is within the limit of  weight it will only cost one postage stamp, which is $0.49. If it  weighs more, it will cost more and need t â¦ o be weighed at the post  office. + 5 others found this useful. Phyllis Jolls.