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No hull hollows are the thinnest razors of all. They usually have some flex in the blade because it is so thin.
Wedges are the thickest, ans are basically pie shaped with only the tiniest hollowing....

Everything has already been covered here so I will only touch on the money issue: it doesn't matter.
I admit I have gone a bit overboard on hones, but only because I like honing and experimenting...