Hard to find black iron pipe and brass valves & fittings for forge burners...metal of all kinds, (copper, tin, bronze,SS etc.)...knife making steel (O1, W1, A2 etc. though you can probably find better prices elsewhere)...ceramic wool refractory insulation for a decent price...diemaker's and EDM stones...etc. etc. etc.
Heck the list can go on and on, if you need it they probably have it! You can often find some items cheaper elsewhere, but on the same note some things are cheaper there as well.
just spend some time browsing through the thousands of items they offer, but be careful you may end up discovering you need some things you never thought of!
