I didn't get any brand names. Call around town and ask plumbing supply houses about it. They stock a ton of different parts. The most expensive are the sprinkler/fire or gas/corrosive environment kind, moving all the way down to cheap irrigation valves. 12 VDC seemed to be special order in my experience, but special order was only a few days. Some home depots have hot water valves for heating systems, not sure how well the worked.
My strategy is to use a high quality bronze ball valve, and then attach an actuator to it. Two separate parts. I can splurge on a fancy, trouble-free valve so I don't have to exercise it much and then get a cheaper motor that does the trick, but real slow. I was offered a large book of different torques, ratings, sizes, etc, so getting higher torque is not an issue, but it does cost more. It is possible to get close to the price of the ELK valve if you buy the parts yourself. I was more interested in NOT replacing the existing valve and hooking an actuator up to it.
I also found a pretty good price on the elk valve. Check out spytown.com, they will email you a price, then ask them for a better price. Beat most every other internet seller by a lot. Can't say I know anything about the company though.