eBay
Linear actuator screw jack with 24 inch of travel (adjustable)
used on a 2 panel solar tracking frame, now the frame is 10 mtrs long and so the tracking drive is different
runs well on any DC voltage between 20 and 36 volts
Powerful 50mm diameter ram
With the information sheet and original box
lots of photos so you can see what you are buying (not upside down and fuzzy)

Post and packing to mainland UK £12
Other areas may be more expensive so if in doubt best ask first
If you want to organise your own courier to keep the cost down,
that's fine and I will parcel them up, we will have to agree a collection date
Deal to be completed within 5 days or order cancelled
Collection from PE22 area near Sibsey