It's all good if it will help someone else.

Out of the 2 5x8 padded envelopes the one from Seattle was cheaper than the one from Aberdeen.

I know if you stand in line at the post office, they weight it digitally and give the exact weight to price ratio and it would be cheaper than UPS.

Being that your time is worth money & standing in line isn't an option, 3 stamps will cover the 5x8 and is cheaper than driving to the post office.