First Class can only be used for items up to 13 ounces. That's about 3.50 at the discounted PayPal rate. Add delivery confirmation, that's $1 more. And if you add insurance, that's $2 more.
If you want to ship something that's fully insured, Priority Small / Regional / Padded Flat Rate is probably the best option.
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If you want to ship something that's fully insured, Priority Small / Regional / Padded Flat Rate is probably the best option.