They had Net 30 terms with me so I said to them, "I'm very sorry, I am buying a house and can't float the money for 30 days. I can refer you to someone else to buy them from."
The general manager of the company told me it was no problem, send the invoice directly to him and he would pay me the day he gets the invoice.
I sent AP and the general manager the invoice and they didn't pay me for about 45 days after they received the invoice.
As a result, I barely made settlement on my house - I was literally cashing in change at the bank. I had no furniture, not even a bed and slept on the floor for the first month I lived there.