But It Has A Plug!!

My shredder finally cut its last piece.  Saturday I went to a local office supply store to purchase a new one.  I had done my homework, and now I walked into this store to make my purchase.  Why this store?  They had mailed me a coupon.  It was only for $10 off if I spent at least $50.  That's easy to do when purchasing a shredder. 

With shredder in hand, I began the check out process.  What!!!!???