I use a product called a clone bucket that was about $80 at the local hydro shop. It's basically about a 3 gallon bucket with 18 2" holes in the lid for foam inserts that hold the cuttings. In the bottom is a 160 gph pump with a PVC T fitting that holds 4 360 degree sprayers (same ones you see in most aero cloners). Dependent on strain, this one generally takes 2 weeks and you have great roots. Easy to put into hydro net pots, or plant, what ever you like. I spent the $80 bucks because it seemed pretty reasonable compared to others.. would be very easy to replicate though. I also tend to replace the foam inserts for each use. If cost is a big concern, the inserts are reusable and clean up pretty well.