So the cheapest way to get Bitcoin Private is probably to buy ZCL? Unless I believe Bitcoin Private will drop under current ZCL prices.
Obviously 'BTCP will be lower because they are giving away 1.25 to 5x BTCP to each ZCL mined to their donation pool (where you donate and lose all your mined ZCL waiting for future BTCP).
But it will start high and drop quickly.