Would you sell for cash?

One way might be to:

Do the transaction during the business day at a bank-- yours if possible, and see if the bank will verify the legitimacy of the currency being used before you hand over the amp. (You can have that done discretely by having the buyer’s employee hand the cash to a bank employee for counting, without necessarily mentioning the verification part). I would talk with your bank before you suggest that though, to make sure they can do this.

Document the terms of the deal and have it signed for. Last thing you want is a tough guy looking for his cash back for whatever reason.

+1 @dill 

Its hard to believe how conditioned we have become as a society. The govt would love us all to make every transaction w/o cash and instead use traceable pmt like a credit card, or a check. Cash is generally not traceable. Although there is a $10k limit which the bank must report anything over that. Recently I heard they were trying to lower the amount to something like $600 instead. I'd accept the cash in a heartbeat. But get the pens and check the bills.

@bkeske  it's not just builders. I am a retired builder. I've had several people pay me with cash, most often large sums. Some yrs back, one lady gave me $10k in cash. That was a somewhat nervous rider to the bank with doors locked

""yah, an employee of mine just so happens to be in your area and also happens to have a huge wad of cash with him... and he has nothing better to do, but to spend his time tracking you down to buy something that''s not even for him". 

That is not what the OP said. Geezzz what a bunch of paranoid people, nobody other than the OP knows the amount of money that is involved.

Cash is King.  I just sold mattresses on Craigslist for $4k.  I love Cash.  But I agree, if you are concerned have the pick-up guy meet you at your local bank and they can check the money.