Yes Denny is correct as usual, they are still in business. 60 bucks gets you their cream of the crop package which includes a materials and parts list and instructions. Honestly, that seems like a fair price if you are serious.
For anyone searching forums wondering if you should get the plans, they are probably the most complete plans you can find. Keyword = most. Although for as long as SpiderCarts been selling plans there is tons of outdated or just wrong information in them which was disappointing to learn. Are they worth it? Yes! Are they super frustrating all the things that are missing that you will have to figure out, yes. Would I buy them again. Yes! Other than KJ racing cross cart, I don't know that there are really plans that build this buggy type of go cart. The KJ racing is a bit out of my league. I am only referring to the grand daddy. Some of the smaller carts may have more complete information.