Yikes, that represents a lot of lost time and money! Just imagining how long it would take me to plant 250 bulbs, and how frustrated I would be to find that they'd been snack food for some rodent.
I think I lost a few lilies to voles last year; I found holes near where they'd been planted, and they didn't come back. That was aggravating; they were expensive, and I only got to enjoy them one year!