There's quite a few option:
If you have not order your parts yet and play on ordering it thru one of the deal here, I see that divemaster has the quick disconnect pretty cheap.
As for wires, it also depend on what encoder you got. If you got one of those cheap one like minipac or eco wiz, all you need is one or 2 ide cable for the wiring. There's also plenty of people here that simple use cat 5 cable.
For one of mine, i just pickup all the wires and connector at the local home depot. their quick discount are about 7 bucks, a bit oversize, but easily fix by the plier.