I had recently gotten a calculator in the mail. In the package, there was a flyer of the cash4calcs company. I didn't bother to look at reviews and sent in my 'really good' condition of the TI-Inspire 84 Plus. It was said to be at worth 43.00. I have been waiting 2 weeks for the payment in my Paypal, and still have not received anything. I've called many times. Can't be trusted... SCAM.