Many tackle shops are bringing in or building their own jig kits, essentially copying Rod's stuff.
Try sourcing hooks and beads - you will find that unless you are buying in the 1000's you can't do much better than Rod's prices. I'm guessing most people don't want to pour their own lead heads to reduce costs.
The only heavy sickle jig hooks I have seen are made Matzuo - though there are several places in the US where you can buy them online.
Some kits use Owner or Mustad heavy jig hooks, but they are not sickle shaped.