I posted this in General Discussion, but it makes sense to post it here. You can print Priority Mail address labels (complete with bar codes) from the USPS site, and when you do they include free delivery confirmation. See the thread for details: http://davesgarden.com/showthread/130071.html
Tip for Traders Using Priority Mail
GW,
Thanks for sharing this. For those that send out lots of packages it could save them quite a bit of money.
I would like to add that it makes sense to add 40 cents to the total and put delivery confirmation on the package. This has been extremely helpful when I have sent a package and I want to know when it got there or where it is in the system. I recently did a giveaway for postage on day lilies and some one emailed and wanted to know when I sent it. I sent them the delivery confirmation and they could seee that their post office had it it was just a matter of them bringing it out to the gardener!!
Happyoma, the good news is you get delivery confirmation free, instead of paying $.40! (If you print off your label from the USPS website.) And while it isn't a lot of money, some of the traders here do a bunch o' trades, and it can start to add up after a while.
Wonderful - I am going to use that from now on!!