Oh my goodness. How heart breaking. I am sorry for your losses. Healthy frogs can be a pleasure to have. This is the hard part. That's a lot of money. What all did your vet do...testing, meds, treatments? If you don't want to answer that's okay. I see it's been a long road for you
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MBD can be treated if caught early on. Once disabling, they have difficulty eating and functioning and become worse and worse.
Rescuing sick frogs is not easy. Prevention is so much easier. I commend your efforts and think highly of you for doing all that you could for them. It says a lot about your caring personality. It is clearly evident that you have given them everything you could. They are at peace now. My heart goes out to you!
Sincerely, Heather