The iCar 2 is available
for $18.50 on Amazon. That's the lowest price I could find with free shipping for Prime members.
The BimmerCode app is incredible, really. Aside from a couple of scary error messages that were easily overcome with a bult-in recovery process, no issues at all. The developer is very responsive, too. He says an updated release is due soon.
I would recommend giving it a try if you're comfortable playing with these kinds of tools. If not, wait a month or two for the early adopters among us to work out all of the kinks and then code away.