I hear that Ghost Iron Ore from Mists is still quite useful for some engineering stuff (goblin gliders I think).
They currently sell for 3g each. So to get enough gold to buy 4 WoW tokens to get the base version of TWW, you would need to farm and sell 428,992 Ghost Iron Ore (at current WoW token price).
I’ll be honest with you. I have seen this question asked many times on the WoWEconomy subreddit. The advice is always something along to lines of “its not impossible, but it’s really not worth it”.
The thing is, you’re going to struggle because there are already goblins on those markets who have already got all that stuff on lock down.
I’m being realistic now: If you can’t afford TWW and would rather non-stop grind 3-4 months, there is a high chance that your PC can’t run it anyway.
However, if you still insist on farming that gold, my advice would actually be to farm and potentially even host your own GDKP in wotlk or cata, buy wow tokens with it, and then put it on battlenet balance to buy TWW
old world ores sell ridiculously well and are easy to farm
In fact they sell so well I’m starting to think the AH bots are starting to hoard materials to become sentient.
What others said, old materials like certain herbs and ores sell nicely. I’m not sure if it’d be easy to get the tokens needed with it, but it still nets a nice sum if you keep at it
Though there are still jobs where you don’t need to leave your house… I’d rather invest time into something like that than farm for hours for some virtual currency when I could earn way more real money in the same time.