JARblue

Pretty much start around $500 and go up depending on the tuner and dyno time. So it's not terrible. Plus a tune does a lot more than just fix throttle lag. It can actually increase power, especially with bolt-on mods.

There's a product called sprintbooster that may help you. But it doesn't really increase the actual performance of the car. It just boosts the voltage of the accelerator pedal signal to the ECU tricking it into thinking that you've pressed the pedal further than you actually have. So it solves the lag a bit without actually correcting the throttle tables in the ECU. At several hundred dollars for this product, I found a tune to be a much better use of my money.

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