I am thinking of Jen all over again. A sick snake, people donating money to help, and bringing in another snake. It has many of the elements of the Jen saga (except you may not have anything serious).

Like many of the earlier posters, I am of the mind that it is unlikely to be IBD because of the time line. But having an autopsy will put any doubts at rest. If it were IBD, sterlizing at this point would more than likely be useless since it has been indicated that IBD is also airborne. As with Jen, your animals are sharing air (close contact).

My heart goes out to you and I am sure it's nothing as bad as IBD..but until you know for certain..being careful is the best course of action and this means not bringing in anymore snakes.
Especially since you don't seem able to afford the Vet bill for this snake.