When I set up my first tank, I bought around 150#LR from someone local who actually brought it over and gave me their extra salt buckets! It wasn't crawling with stuff like if I had bought it from somewhere like TBS, but it was around $1.50/lb and had a good amount of coralline on it already.
My tank barely cycled with that and some LS from another local person. It had a ton of bacteria already established and only had some dieoff for the first week.
If I had the $ I would get some from TBS just because it really is fascinating what can come in on that rock. I feel like you could put that in and be happy watching just the rock without adding anything else!
-Joe