Help

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

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

How can I convince them?