Genesis once bubbled...
if you can find a source for HP solenoid valves for $100 you'd be considered a "God" by many.
The best number I've seen on solenoid valves for HP (5,000 psi service) use is right around $500! Thus, the suggestion to use a pilot valve arrangement instead.
Mine is a pilot valve. It was one of the presure oporated valves that I had to replace not the solonoid valve.