Well for one, PS and TRS get a "shipping discount". This USED to apply to even small flat rate boxes. Then I noticed in January that it no longer applies to the flat rate boxes, only medium flat rate and some other things. So basically you don't get anything for discount any more. The only other thing is when you go through ebay/paypal shipping, you are getting commerical base rate so it's cheaper than going to the post office to do it and if you ship flat rate, you automatically get a tracking number free, opposed to 90 cents at the post office.
If it will fit into a padded envelope and is less than 13 ounces, ship it first class mail. If it is VHS / DVDs / Books then stick it in a box and ship it media mail. Media mail is THE cheapest but will take forever and more times than not I don't think there is even a tracking number. First class I use but most of the time I utilize flat rate boxes and the padded flat rate envelopes.
I offer "free shipping" on auctions now since some buyer wanted to give me a 1 star DSR on shipping cost, when I actually LOST money by under changing on shipping. Never again will I get screwed that way. Free shipping plus a 1 day turn around, no complaints.
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