I’m constantly surprised by questions such as this one. They invariably go along the lines:
I heard that I need to get a Mac to do iPhone development. I want to do iPhone development but do I have to buy a Mac? Is there any other way to develop iPhone software?
If the projected sales for your app don’t meet the cost of a new computer, whatever platform you’re developing on, it’s time to get a different idea for your app. I speak with the smug self-confidence of one who has yet to get his own app within smelling distance of the store.