I just say 'no'. They've never refused my money.
Try what I did once. When the "clerk" asked me for my last name, I said "Sale". He had a hard time spelling that, and then asked for my first name and I said "Cash". After a few seconds of letting this puzzle sink into his pea brain, I said, "Just write down Cash Sale and don't ask me any more questions.
He had a difficult time comprehending that, but after some hesitation and herculean mental gymnastics on his part, I walked out with my merchandise.
I seldom purchase anything from RatSh!t because they can take a piece of wire 2" long and turn it into krap (tm). Sometimes they are the only place to buy some simple electronic part, but their stuff has been so bad, that I'll go to the local Rite-Aid, Walgreens or Walmart instead of buying from RatSh!t.
There *is* some pleasure though in saying "Just write down cash sale, ring it up and give me my stuff" to the stupid retard there.
About the only question they have answers to is "where's the door?"