Got my used column (seen below) from a breakers yard. Used the elecy columns go for £50 - £75 over here.
Make sure you buy one with its ecu, else its not going to work !
You need a seperate control unit which you can pick up for £30 up - dep on type you buy
You can see it (small silver box) top far left in the above pic
Mine is not speed sensitive, but tbh once you set it you get used to it at any speed imo
The rest is diy and mates rates to get it welded up and fit your self on the weekend
hths