I sent in two calculators a few weeks ago and didn't get my check, so I thought it was a scam. I called their 1-800 number and they confirmed a check was sent... it turns out I gave them my old address by mistake... they ended up cancelling the first check and I got the second one a few days later, and they ended up giving me a coupon for my next order for having to wait so long. I was scared at first about sending my TI-83s in, but in the end everything turned out ok.