you could always rig up a pretty simple (and cheap) cooling jacket.
The Alaska Bootlegger's Bible has some pretty simple setups using simple stuff like a milk jug, putty, and some ice with salt on it. Siphon the hot wort through a long tube into the fermenter, and pass the tube through a bucket or large plastic jug filled with ice with the salt on it. Spiral the siphon tube around a few times to increase contact time. Voila, chilled wort.
Actually, most immersion chillers work better if the chiller is placed in a bucket of ice water, and the hot wort is siphoned through the chiller, rather than the chiller being immersed in the hot wort. Its just a more efficient transfer of energy