one note about a chiller...
ever feel that haut exhaust from an AC unit? that gets vented outside with air conditioning.
with a chiller that hot air will go into whichever room has the chiller.
just something to ponder as you plan things.
you definitely do need to do something to get that heat under control.
i think a new unit that's cheap would go for 500 bucks.
a used one would be less, obviously. they are a chunk of change.
have you tried ebay for price knowledge?
then check out a new one at marine depot or something to know what the typical etailer charges.
you might be able to swing a deal off one of our local vendors.
scott merrill might be able to put together a group buy...