I'm betting Speeduino could be done soup to nuts, injectors, pump, TB, regulator, hoses, sensors, wiring, electronics, coils, trigger wheel, for less than $1000. Worst case, $1500.
In my case, I bartered my CB throttle bodies, injectors, TPS, rails, pump, and regulator(About $4-500 new). I already have a trigger wheel, VR sensor, and coilpack due to my $160 Megajolt install.
I might spend another $300 to buy the brain, case, and build a harness. Add a few sensors: IAT, engine temp, maybe an idle air control valve(and a driver board).
CB's unit is easily almost $3k. Homemade is half the cost, or less.