If you don't have $400 to put up as collateral, I would just get a credit card. There are a lot of benefits to having a credit card. You can get 1% to 5% cash back on everything you buy, build credit, get better fraud protection than a debit or ATM card, and you can use it in situations like this as collateral instead of loaning a company your own money.
I do agree that Google should allow standard, old fashioned RMAs for people without credit cards who don't mind waiting though. That sucks.