I think you're going to be very hard pressed to find a (safe) regulator with a solenoid for anything less than $125-150.
Disagree... I have one been working for four years now ... no problems. I paid $50 for it. I do agree that you have to be a bit more careful especially when it comes to EOTDs. But those can be avoided with vigilance.
Anyways, if anyone has a lead, or an idea, I'd be more than happy to consider the options.