I got a slightly older version of this scale from Amazon.com :
http://www.amazon.com/Weighmax-Digital-Postal-Scales-Shipping/dp/B000NP4C8S...and I love it!
PayPal shipping is awesome! Once a payment has cleared, just go to your account and choose "print shipping label" from the correct transaction and follow the steps. I find USPS to be easiest and flat rate boxes are the BEST! If you go on USPS.com and set up a free account, you can have the Priority boxes and envelopes sent to you for free. Really easy and convenient.
After you print off your label don't forget that you can schedule pickup for your orders, that too is a free service.
When do labels thru PayPal it automatically adds delivery confirmation which provides a tracking number.
Get yourself a good tape gun, and I save packing material from things I buy as well as newspapers.
I have never purchased labels. I print onto plain white printer paper and tape the edges to the box, just be sure not to tape over the bar code, apparently this can cause a bit of trouble for the postman.
Good Luck!!