I thought it was a bit high, but I've heard some outrageous prices. I paid about $90 USD for the neuter but there was a $48 office fee. I've heard vets quote upwards of $300-500 so check in with your vet and see what he/she will charge or work something out.
Spayed, not spade. However, males get neutered, females get spayed.
General costs run from $50 - about $300. More than that, and most likely, the vet is hoping you won't want to do it. (Yes, some vets actually will quote extremely high prices, instead of saying they don't want to sputer rats.)
The best thing to do is call around your area vets and see what they charge.
After *3* weeks, then you can put a neutered male with females.