It's very unlikely you'll find any other shifter kit near as good as
Sick Bike Parts - let alone at a lower price.
The reason for the cost is the quality parts they use, in particular the HD freewheel sprocket. While it's true that they cost about the same as the engine kit itself - it's a disproportionate comparison really. The HT kits are mass produced (and shoddily too lol) by the thousands - whereas the shift kits are custom built for us, with actual attention paid to make sure everything is proper. Another advantage is ya can just give 'em a call or post here if you run into problems - I don't think Jiangyan YuanDong is gonna have that kind of customer service anytime soon heh
When ya think about it, it isn't really that much for what it is - the super cheap engines tend to skew budgetary perspective lol I know it has mine