For the Hondata with all the "options" to tune and burn your own ROMs is about $1100.
When it's completed next month, our new engine facility in Hudson, NH, will have an engine dyno that's setup to run domestics like Chevy and Ford and also to run Honda engines. So I'll have a full Hondata setup for tuning, plus unlimited access to the engine dyno. It doesn't help if the engine is already in the car, but if you're building a new engine, it's great to be able to test and tune it before you install it.
Once the new facility is setup, I'm going to see if Hondata will list me as a dealer.