I have a Regency wood stove insert. It is their smallest model, except my doesn't have any legs or base since it sits in my old fireplace. Wood stoves are not something you just haul from the garage to the home. With your price point, I would strongly advise on going a different route. For example, invest in some things like base layers, thick sweaters, wool blankets, foil emergency blankets, sub-zero sleeping bags, air mattresses, etc.. I don't know where you live, but if extreme cooler temps are an issue, then consider some sort of space heater. Just take all the precautions that need to be taken. For example, with a portable kerosene heater, store the kerosene away from the home (buy or build a storage unit to put outside the home). If you decide to use a Buddy Heater with a propane tank, consider storing a few 20 pound tanks and find a way to run the hose from the tank outside the home to the heater (numerous connecters and hoses). Read up about leaks, how to seal connections well, and of course other safety issues. Buy two carbon monoxide detectors to help with possible incomplete combustion issues. Between good clothing and a good heater, one should be able to survive. Now with the food issue, get some camping stoves that also use propane. One person can cook outside if need be. Also, there is nothing wrong with buying a used charcoal grill and using that outside on a porch, or maybe an outdoor patio (consider building a wind block wall due to the cold air).
You may have to go the above route because $400 won't cut it. My Regency insert was $1,400 installed. This didn't include a stainless steel pipe that had already been installed for the previous wood stove. One suggestion is to maybe call a few wood stove installers and see if they can give you a call if they come across an older stove that really is still usable. My old stove was an insert and was from the 80s (original owner put it in I believe). The fireplace/stove guy said there was nothing wrong with it, it was a good unit, but it had just been used improperly. The prior owner of the home said her husband had used it once and it warmed up the entire house. When I decided to upgrade to something newer, they took the old stove. I don't know if he sold it, scrapped it, or just tossed it away. I've heard there are always older stoves coming up for sale on Craigslist and what not. Even with a prior used working stove, you are likely still looking at $1,500 for installation, if not more.