I would then ask the seller why they are charging $7.00 for stuff that the post office only charges:
$2.34 for 1st class postage (.49 - 1st class postage, 1.30 - insurance, and .55 delivery confirmation) or
$5.60 for 1st class postage (3.85 - priority, 1.30 - insurance, and .45 delivery confirmation)?