One must be VERY Careful on what you select (or is PRE-Selected for you) when doing labels. I use Paypal to print as Bonz does charge you a fee to print labels here. Paypal charges no fee to print but even so, it seems to always default to the most expensive PRIORITY mail service unless you change it and sometimes even if you change it, and then change the ship date, it RE-Defaults to Priority so you need to take a last look before committing to purchase the label (on Paypal).
Of course, if you use Paypal, you will then need to copy/paste the CONFIRMATION number back to Bonanza order once you mark it shipped here as it does not port this info over like Ebay does. Since I answered this, no doubt support will look at this thread as it seems they maybe monitor my answers lately (I still think I am on double-secret probation here) as they censor some of my other answers here more often than not it seems (even if I am telling the truth). Good Luck.

Similar to your situation, I recently sold an item with shipping in a USPS Flat Rate Priority Mail box. Then when I went to print the label, Flat Rate Priority Mail box is not an option. So like Atomicdiner mentions above, print your label directly from PayPal rather than here.