You can sign in on
www.usps.com and get the Priority boxes and tape for free, and they deliver them to your home.
You can also get the Priority Tyvek envelopes, turn them inside out and tape or staple them closed if you want to send something "not" priority. The tyvek is a very secure envelope, and the inside is white.
Sometimes I wrap a box (could be a cereal box LOL) if its the right size! Then just wrap it with the priority Tyvek envelope!
I also use
www.stamps.com and print my own postage. Often times I can skip the post office all together and put the items in my mailbox for the postal carrier.
Stamps.com was running a promotion for a free scale when you sign up, not sure if they are now.
Delivery confirmation is free if you print off the label (with or without postage) on the
www.usps.com website. That saves .45 that you can still charge the buyer. Helps to cover those PayPal fees.
Good Luck, and hold those items until the check clears (been burned).
Oh, one more thing, never ever click on an ebay link in an email and fill in your information. My friend was just burned by this.
She recieved an authentic looking email from "ebay" and it said to fill in all her information ... well her bank account was emptied. She will get it back, but why set yourself up. Just be overly cautious. Ebay and Paypal will NEVER ask for your information again.