Hi,
I normally sell my extra stamps and books online.
I recently bought some baseball cards and put up the doubles, which sold very fast. I was able to use
ebay's standard envelope shipping option. It cost 51 cents per envelope and was trackable.
First sale, per tracking:
Mailed Buffalo NY Mar 29th
Destination Processing Sacramento CA Mar 31
Out for delivery and delivered Apr 1
That is the info that is available by tracking, all for 51 cents.
I'm impressed. I hope that they offer that for stamp sales, soon. Normally when I mail collectable stamps that I sold, I load the outside of the envelope with ~10 stamps to total 55 cents. This tracking is quite nice for just a regular envelope.