I was able to get a couple from a place my brother worked but most came from the City of Edmond. They have moved to a new location and it has not been as easy but I also think the REC
type coops would provide. Edmond at some points had them stacked up and was glad to see me move some out. I have put them in new empty ponds (always easier), and in a full lake.
Really simple though in the full lake--we just swam them out to where we wanted them and brought the cinderblocks via boat and worked it over from there. Most of those spools have steel rods and plates holding them together (especially the bigger ones) and the wood material is of higher quality. I think they will last a long time! It is really cool when you can get small ones so you can use them in multiple depths. If you can get many they can be put in pods grouped in triangles, etc. They are a great ambush point for the bass to hang from.
Can't say enough how we have been catching fish off them.
There is something exciting about creating cover and then doing well fishing it that is a turn on! Good Luck!