Sorry to hear the situation you're in,
Like orandagal said a large swimming pool might do the trick, or a large plastic pre-formed pond, you can get rectangular ones.
If you have a garage or large space then putting it indoors would be more ideal as I'm not sure how the outside of a pond or pool would manage if you get bad snow or freezing temperatures outdoors.
A swimming pool would be much cheaper than a preformed pond as well
Or another option would be to grab a cheap pool or other tub large enough to house the fish and buy new pond liner, then you could move the fish into the pool/large tub, empty the pond and then lay the new pond liner over the top of the old one, then move the fish back in to the pond once you'd filled it back up.