like others have said, wait till close or after thanksgiving and you will find turkey fryer setups for ~$30 Usually a basic round stand with a 7.5G aluminum pot.
i got 5 gallons of water boiling on the bass pro shop one in around half hour at medium-high flame. figure 6-6.5 won't be much problem. stand seems sturdy and doesn't seem to use much propane. my tank was almost empty after the summer. so much so that i could lift it with no effort. but i still managed to use the flame for an hour with gas to spare. i'm not really worried about time to be honest a lawn chair and my netbook will be great. just surf the boards during the wait