I picked up my Solenoid from Surrey Fluid and power. Like I said in the beginning of this thread, you can find most good methanol compatible things there. They have threaded connectors, accumulators, and solenoids. I havent bought anything else from them, But you probably could get the line there too. I do know they wont have nozzles. But a good alternative to spending a lot on nozzles is to check out Mcmaster-Carr nozzles. They work like a charm. Just be sure to include a good check valve close to the nozzle.
Surrey fluid power
-fittings (most pushlock fittings available. 90s, threaded, couplers etc)
-line (probably have that too, seeing as they are everything power pneumatics)
-Accumulator (for if you dont use a recirculating pump)
For nozzles check out Mcmaster-Carr nozzles. (Cheaper than most, but work great)
You may be able to get nozzle holders through Surrey fluid power, but you wont be reffering to them as nozzle holders. They will need the concept behind the fitting, and thread sizes etc. If not, go through RTM racing, they seem to have more methanol components than ever.
As for check valves, go with tried tested true Brand name check valves. They should have ~10-15psi cracking pressure and be methanol compatible. RTM racing can get these for you.
$$$$ Run some wire, set up a relay, mount the solenoid, mount reservoir, put in a pump, run some line.... And you are set. Trigger it, and make MOAR POWA!$$$$
