I'm guessing something like this for the labels. Sign up for UPS, I think they still give a limited amount out free but it'll have UPS logo.
Any cheap scale would work.
If you ship a lot, do yourself a favor and get a thermal printer. I run a zebra 2844 and use the free UPS 4x6 thermal roll.
"Note: It is crucial to know that First-Class Package is not the same as USPS First-Class Mail. First-Class Package service is for shipping packages and poly mailers up to 1 pound. First-Class Mail is for mailing letters, large envelopes, and postcards."
I don't understand why the CSR didn't...
Here is a recent label for a first class package. It was a bubble mailer, 7x5 inches and 3 oz.
My label says First Class Package instead of First Class Mail. I believe your label is meant for manilla or any large flat envelope. That's why they wouldn't accept it.
Is it a box, bubble mailer, or manilla envelope?
If it's a box or bubble mailer, they won't accept it. That kind of postage is more for mailing documents or "flat" items. If it's a manilla envelope, I don't think they can add tracking manually to it.
I don't have this problem.
The question is, how are you getting $2.64 when it's $4.55 for me? 7 oz FCM from NJ to WA.
Edit: Looks like you picked first class envelope. Those do not have tracking.
If you are satisfied with Verizon, I'd recommend getting a phone that is compativle with Visible. I have plenty of family on Visible and they all seem to be happy.