Originally Posted by sdsearch

I have my doubt that it would count (office supply stores are typically stores that sell paper, toner, ink, packing supplies, etc, etc), but I think the only real way to know is to do a test purchase and see whether it earns 5x or 1x.

Meanwhile, if you looked up that vendor there, doesn't that mean they accept credit cards directly? I don't see why in the world a vendor would be listed there if they didn't! So you may want to research further to see if there's any way to pay that vendor by credit card without using Plastiq (and thus without having to pay the 2.5% fee).