Just a heads up, I happen to be in banking. And if there is a fee to make cash deposits (most institutions don't charge) it would be far less then the typical 2-3% to process a credit card transaction. And as someone pointed out, if I were to not report a sale and had cash, I'd probably spend it rather than deposit it into the bank.
That aside, I really hope that a two bike sale will get us a little deal.