search craigs list for a tote tank and leave it there with a float valve as mentioned before. Inform them that is the only you will be able to do these for that price and you will be lucky to get 1.00 in my opinion. It will take you less than 30 seconds per car, if your only doing the hood, roof, and trunk. Get a guy you trust, pay 10-15 per hour and leave this to him every time you wash them.