Depends on packaging, it can go 1st Class since under 13 oz, but has to be weighed at post office for exact amount. Will only be a few dollars at most.
The cost of postage depends on how much it weighs and the country where you are mailing it and its destination.
is extra postage required for mailing a gift card
52
go to the post office and use their machine that will weigh it and tell you the amount of postage for each type of mailing
This depends on where you are mailing the letter from, and the dimensions and weight of the letter.
40 cards
According to Netflix CEO, Reed Hastings, Netflix spends about $600 million per year on postage for mailing its DVDs.
60-75 cards,
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About 100g
$0.46 For one postage stamp at USPS. Most postcards made of paper will only require one postage stamp. Some heavier postcards may need extra postage. To determine how much is required, weigh the postcard before mailing it.
40-60 but go for 40