[mcyger]

It can also be:

1. Lease the domain with a small cash outlay per month

2. Prove your business model

3. Make money

4. Make a balloon payment for an agreed-upon purchase price (prior to the contract signing) at the end of, say, 3 years term.

This gives the buyer a way to walk away if the business doesn't work out, but lock up the domain from others buying it out from under you in case your business is getting traction.