The kit I got was the most expensive of that particular vendor's starter kit family and it cost me about 105RMB (15USD). It comes with everything in this picture—original left, (bad) translation right. (Click through to see full size with readable translation.)

It's not a top-quality kit, obviously, at that price. A top-quality set of chisels alone would be more than five times the price of that whole set, but for beginners it's absolutely fine. The weird rubber stamps are basically a way of getting an image onto your stone for practice. Anything that's not red after you do your impression is to be carved down. I don't want to have to learn carving while I'm learning Chinese calligraphy, so that's a bonus. Loads of these kinds of rubber stamps are available for both direct use and for practising seal carving, and practice-grade stones are about 0.25USD each. (High quality chop stones can exceed $20 for the size range displayed here and can exceed $600 for the more esoteric stone types in larger sizes.)

And if I decide I enjoy the hobby, I'll upgrade the components over time.