Lots on eBay! So many different flavors. You'll have to dig through the spec sheets.
Generally you purchase the valve body and actuator separate from each other. If you're trying to do this on a budget, it can take a lot of digging to find a cost effective pair.
The valve body choices are pretty obvious. The actuators are available in different voltages and modulating techniques.
Most on eBay are on/off control, no modulation.
Personally I like the floating actuators. Easy to control. Two pins: pulse one to close, one to close, and it'll hold its part-way position when power is removed.
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