For the best bladesmithing forge on the planet, call or email Tim Zowada.
If you are getting started and dont want to spend a bunch of money, but want a good working forge, go do Don Fogg's web site. He has a good set of instructions for building your own. It will cost you about $100, the most expensive thing being the liner.
I have one of the "home mades", but when it wears out, i will be calling Tim.
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"Eternal vigilance is the price of liberty"
Thomas Jefferson