balls are so darn finicky... i put a lot of energy into getting every new batch / purchase switched over to frozen thawed rats, which works for 98% of my group... but there's those few that have to have mice and i've been around long enough to have tried everything and i just can't turn them... 10 month wait, 12 month wait, they'll do it if they want... so, i would not underestimate their resolve... get a bunch hooked on hamsters and they'll be real hard to switch back... sell them and you've now made it someone else's problem which is not good.

also - do hamsters cost more?

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