Reptiles can be surprisingly hardy. I'd say that as long as there is significant improvement, then continue on course. You will be faced with a decision sooner or later, depending on how things progress.
1. Snake gets better, woohoo!
2. Snake plateaus. Stops getting better, still sick; not getting worse for the time being. This is when you should again consider taking it to the vet. Systemic antibiotics at this point, plus further attention to any related problems will likely get the snake over the hump and save it's life.
3. Snake stops getting better and begins a down turn. At this point there is still a chance to save it, but considering your financial concerns, my opinion would be that this would be the time to euthanise the boa.

If you decide to euthanize, I would still call a vet. Many "at home" euthanasia solutions are actually quite cruel (freezing is a perfect example). Some vets might consider euthanasia without costs considering your situation.

Good luck with your snake. I wish you all the best.

Ian

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