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if you really want to go on the cheap I know a guy who uses yellow river clay instead of refactory
coating. this guy uses it in his cupola to melt iron for casting iron. he used it to line the...

I have seen some setups that are relatively cheap, some ideas are shown on youtube.
YouTube - Greenpete's Knife Making pt1of4
this one is part one of four, shows what can be done with very little...

I like the idea of using a granite stone for knife making, probably because of my close proximity to Granite Falls, MN.
See if you can find some fire brick for making a kiln, a forge is not going...