Aluminum is a darn good conductor. One of the best, a pretty poor resistor material choice. aluminum foil is pretty thick, as thick as a 1/2 oz pcb copper pour. Unless you cut your foil really thin and make it really long, any appreciable resistance will likely be due to your contacts between the foil (which has a tendancy to develop a nice insulating sapphire layer) and whatever you connect to it.
That said, if you have a ohmmeter that can go that low, try it, then try whatever other metals you can find. Steel wire may be good, (pulled from steel wool? inside a twist-tie? section of cheap bike lock cable? you can probably find something around) . When you find something that seems to work, wiggle the contacts and make sure they are not contributing to the resistance, measure it again after it gets warm and see if it changes. ramp up the current slowly and keep an eye on the temperature rise to see if it will stand up to the current.