I have a product that I'm going to be selling on ebay. This product can easily fit into a normal 3 1/2" x 6" envelope, which is what I plan to use. However, I would like to add tracking to all of these "letters" I ship out. I have done some research and it seems it will be about $1.05 extra if I go to the post office, or like $0.23 or something if I do it online. Naturally, I would like to go the cheaper option. I have never used ebays print shipping labels, I always went down to the post office and had them do it... but for this certain product, I think I will begin doing that. Anyway.. my question is, if I am printing out these shipping labels, would I still need to put a stamp on the envelope? Considering I would already be paying for the label, and adding tracking... it seems kind of redundant to put a 49 cent stamp on top of all it. I am starting to do the math and it is chipping away at my income margins, as my product is in the $2-5 range... so I would like to save every penny I can if possible. Any suggestions, and do you know if I would still need a stamp? Thanks much.