You can get your cat cryopreserved at CI or Alcor, but it is costly....at least a few thousand dollars (but likely a lot more), the last time I checked.
The only other option is a "straight freeze" (just preserve it in your freezer). This is the last hope for a person or pet. There will be a lot of freezing damage, which will theoretically make it harder to revive in the future, but at least there would be a tiny chance of revival. If you were storing your pet for a long time this way, you would eventually want it frozen down to liquid nitrogen temps.
If you did a straight freeze, then you would have a little more time to save up money and make arrangements for long term storage/revival.
You might want to check Oregon Cryonics to see if they would do a chemical storage. This is a more damaging form of preservation but likely cheaper and easier.