Help

So my instructor has a littler of Persian ragdoll kittens and the are gorgeous. I have wanted a cat for a long time now and this is the perfect opportunity. Normally those kittens sell for $1000 but my instructor is selling them for $500 and students get $100 off.

My parents have always said no and they don't even have a reason. No one in the house is allergic to them, our dogs are just as much of an annoyance to the wildlife, our dogs don't care about cats and our dogs shed heaps of fur anyway. Plus we live on a farm and we have mice in our stable.

How can I convince them?