Brother QL700 postage labels (stamps)

Anyone know what are the dimensions of the postage labels for letter-rate stamps printing with the Brother QL700? On the Pitney Bowes Smart Postage website, they have some for sale:
"Printable Postage Labels - Die Cut 1 Roll - Roll Width – 1.625”

...but I'm trying to find them cheaper on ebay, and I can't find ANY at all on ebay. I can't even find any talking about this via Google search.

I bought some Brother SHIPPING labels (2.4" continuous roll) on ebay, no problem...plenty of those. But now i want to print letter stamp postage at home, and can't even really find any info on the sizes required for this.

I've found plenty of "address label" rolls on ebay, and one sample roll even came with my printer, but I don't think those are the same as the stamps postage labels....or are they?