Just to add a little justification for the cost, even building your own kit isn’t cheap. I just added up what it would cost me to replicate everything on my truck as it currently sits, and it’s right around $600 that I have in it. That not only includes the material to fabricate the sfd components, but also the front and rear HD springs, extended shocks, limit straps, etc.. Once you factor in the labor time to fabricate the kit, and the fact that there needs to be enough profit to make it worth your while, there is a good reason that it isn’t cheap to buy a good pre-made sfd kit.
If you’re not trying to make a profit, have the means, and just want to make a kit for your personal rig, then the DIY approach definitely saves some money.
This also makes a good argument for waiting for the upcoming “pines to spines” kit. As I understand it, they are making the components modular, so if budget is a concern you can start with getting the parts for a mild lift, and then “grow into” bigger lifts later on by adding onto the basic kit. Correct me if I’m wrong on that....