we have used them for a couple years also. You can go to their website and signup and order all the priority boxes, labels you want. They would used to (may still do it) even print your company name and address on the lables. There is no cost even for shipping all the boxes to you. The best deal they had but quit giving it away was tape. We had rolls and rolls of it. Wish I had more!! The flat rate boxes are not a big box like a #7 but they would work great on sending a bunch of strikes. I sold a mess of racing magazines on Ebay 2 months ago and stacked them in there and it was $8.10 to ship. Would have probably cost 25 or so reg. Priority.