I had 3 of my collection develop RI's about 2 months after I got them (all from the same person). The initial vet visit for the 3 was nearly $300, which included a culture for the worst one, and Baytril injections all 3. After a few days, they weren't responding to the Baytril, so they were all placed on Amikacin (oral), which ran me another $30 or so.

Hands down, the best money I ever spent. Just keep on top of it. Fingers crossed for you!