I have looked all over the internet for a class 3 hitch that does not cost $1,600 from the LR factory. I live in the U.S. and can't find a less expensive one. There are "Sport" hitches that are after market but not any for my Si6. Does anyone know somewhere I can get one? That you all so much!

Welcome to the Forum, and thank you so much for your polite attitude!
Your Disco is far too modern for me and I fear you may well be on a loser as regards finding what you want.
none of these of any use then?