How do you can get traded in f2p its not insane but it will give you some money. If you are patient enough you can make even bond but it takes hours.
Hammer cost 1gp each shop has 5 and in the grand exchange they sell for 40-50gp each so full inventory of hammers is worth 1350gp.
Where Its Located?
It is located in falador and why because its closest to the bank you can also use edgeville general store.
What to Buy?
Each time you buy you must change worlds because restock time is 1min and changing worlds is faster.