I try to exercise patience best I can when dealing with clerks and CSR's. For one thing, I NEVER go in a place like Best Buy when I'm in a hurry and have to be somewhere. Secondly, if I got tied up where it looked like it might be 10-15 minutes with only two customers in front of me, I'd march over to the customer service desk and get them to tab me out.
I understand your frustration, but did having an ugly confrontation with the manager really accomplish anything other than raising your blood pressure? If it were me, and there was no way to get checked out, I'd leave the printer on the ground and walk out, never to return. I wouldn't even bother with explaining to anyone how they just effed up and lost my business for a life-time.
F him Conan. After that punk, oh I'm sorry, king of his little BB world while clocked in, he is just another Tulsa area inhabitant. BB lost money to Staples over this f'er, which is what I told its district manager. I hope he gets his @ss fired.