"Thermos or Dildo" joke

This guy just started at his new job, working at a porno shop. His boss comes out and tells him that he has to leave for a while, and "can you handle it?"
The new employee is somewhat reluctant, but with the boss's positive comments he finally agrees. So, the guy is there by himself for a little while and a white woman comes in. She asks;
"How much for the white dildo?"
He answers, "$35."
She, "How much for the black one?"
He, "$35 for the black one, $35 for the white one."
She, "I think I'll take the black one. I've never had a black one before." She pays him, and off she goes.
A little bit later a black woman comes in and asks;
"How much for the black dildo?"
He, "$35."
She, "How much for the white one?"
He, "$35 for the white one, $35 for the black one."
She, "I think I'll take the white one. I've never had a white one before." She pays him, and off she goes.
About an hour later a young blonde woman comes in and asks, "How much are your dildos?" He, "$35 for the white, $35 for the black."
She, How much is that plaid one on the shelf?"
He, "Well, that's a very special dildo it'll cost you $165."
She thinks for a moment and answers, "I'll take the plaid one, I've never had a plaid one before." She pays him, and off she goes.
Finally, the guy's boss returns and asks, "How did you do while I was gone?" To which the saleman responded, "I did really good, I sold one white dildo, one black dildo, and I sold your thermos for $165!"