If you are satisfied with the care and service they do, and you have a good feeling about that place and the rabbit, I would say a few bucks more or less don't matter much. Since you have already rabbits, topics like help with bonding are an issue (I don't know much about that), if all that looks good and you can find people with good experience with that place, why not.
Someone making a little money isn't always bad when it's worth it.
I mean, sum up what you spend on pets over their lifetime, compared to that imho the purchasing price dosen't put that much of a dent in a wallet.
It sounds a lot though, so I would have a very close look if it is worth it for you, it could be just a ripoff too.
I could get a bunny here for 10-20€, have it neutered for 100-120€, so that's not that far off. Dunno about shelters, or what they charge here, don't even know one that takes rabbits.