I Think I Need More Bikes

I recently posted about aspiring to know how to do the foot down turnaround. Honestly, I want to know how to do everything that has anything to do with drifting a bike.
It turns out, I have a few problems.
First, my front yard is a terrible place to try this with a street bike. (I can't get traction with my front tire enough to do this with the front brake released. This is a move that is not meant to be done with the front brake engaged).
Second, I actually care about this bike and don't want to wreck it again. (I've already had to rebuild it twice now in the eight years I've had it). I can't learn a stunt if I'm afraid to let my machine go down.
Conclusion, I need more bikes including but not limited to a stunt bike with an actual slider cage (or an old junker that I simply don't care about how much it goes down) plus a dirt bike or a street bike equipped with dirt tires, so I can proceed with my mission to learn these stunts.