at 60 smithing you can go into the furnace without paying a fee.
my money making...
buy 1000 addy ore from ge
buy 3000 coal from ge
carry only;
all 1000 coal in notes
like 50k cash or so
28 addy ore at a time, non note
just bank run the 28 addy to furnace, make bars by note trading coal notes to the npc. then carry the bars back to bank and repeat till you finish all 1000 addy bars. takes about 2 hours if your up on your running.
1000 addy bars sells for craploads in ge, and sells very very fast.
dont smith the bars till you level and can craft a addy consumable like arrowheads, darts, throwing axes. whatever.
smithed consumables - sell more then bars - sell more then anything else that can be smithed.
this same strat can be done with any type of bars and ore, but i do addy
when im in the mood i will do 5k bars. and earn nearly 10m in 5 hours