I shipped my calculator on May 7th and I checked the delivery confirmation and it was received by the company on May 10th. Today is May 17th and I have yet to receive my $25 for my calculator, which they say will be deposited into your Pay Pal account in 24 hours after it has been received. I emailed the company and have yet to get a response. I called today and got someone's voice mail. Something just seems fishy!