hmmm...
y8 head - 75-150
valve cover - 15-30
ecu - 50-100 or vafc usually 140-180 on ebay
timing belt - like 8 bucks
0bd2 dizzy - normally 150 everywhere
y8 headgasket - about 20 bucks or you can get the z6 gasket but it will lower compression slightly.
vtec solenoid - good luck finding one that somebody wants to part with.
The head may or may not come with the sprocket but those usually run about 20 bucks.

The reason why the prices are so high is because I have to get the parts from salvage yards.It would be alot cheaper if you just bought someone elses set-up.