[klous]

One weird thing you can't do with Simple is deposit cash directly through any ATM. They do not allow that. The only way is to get a cashier's check or similar instrument OR deposit cash in an account that does accept cash then transfer the money (and wait several days for it to clear)

[toomuchtodo]

This is correct, and while I haven't and should never have the need to do that, I understand some people may require that functionality.

EDIT: It appears you can get a money order at Walmart for 70 cents, and $1.20-$1.60 at USPS. Cashier's check at a local bank would be ~$5-10, depending if you're a customer or not.