You can build your own! For complex watering needs, it's still relatively easy to write a short program that specifies exactly how much water certain areas need. You hook up some solenoid valves to control the flow of water to each area. If you really want to get fancy, you can also connect soil moisture sensors and have the watering start when the soil gets dry and end when it's sufficiently moist. There are some examples on Google.

Thanks Dean. I have looked into that option, but its not for me.

check out THIS youtube. It's a pretty basic set up. Also it looks like geared toward broadleaved plants, not conifers. Also I would make it higher so I could go inside when it is covered.

I'm sure you know that you need electrical supply. Your water supply needs to be potable water, not pond water. In addition to a solenoid I would put a strainer on the main line. Everything needs to be completely drained and dried out before freezing temps. For myself, I would have a professional electrican do the hookup and grounding. Water combined with electric needs to be done by someone knowledgeable.

The great thing about softwood cuttings is that there is no bottom heat required. Also they root beautifully and quickly. Your setup will vary depending on what part of the country you are in.