Yes, I use DHP, you can find them here and on clubgp for around $250 (used of course, they don't make them anymore) If your looking to get one and you see one for sale, grab it quick, im not kidding you when i say they go fast. Also make sure its a keyspan unit with aux inputs.
There is also hptuners, you can get new for around $500 from almost every 3800 vendor.