I've come across quite a few sites with domain names for sale. The cheaper ones (in the $50 - $500 range) are mostly pretty lame. Why not come up with one really good business idea and memorable domain name and make that work. That way you won't be yet another squatter but a Value Producer.

BTW every business I've ever come up with, I've had no problem finding an available domain name. You just have to be good at getting to the essence of your business and it's value. It's also known as "marketing".