Creating oak dungeon doors using Stealing Creation hammers
Alching. Try to find an item that alchs for more than their value price.
Burn maple logs once you are able to....then keep doing that to 99. This is the cheapest way to get 99 FM if you feel like spending alot of money then use higher ranked logs.
There is a guy called Lonezer0, he has 99 construction.
charging air orbs you will accuatlly make around 400k per 1k orbs
I have placed a link below that will take you to a guide that should have the information you require.
Well if you want the slowest xp but the cheapest way to 99 crafting. Well here it is, 1-99 cut opals all the way but this will take a while as in (5 months) you will need to cut atleast 1m opals but it can make you some money depending on the price of them.
Fletching for members. (Maybe construction if your willing to spend 200m). For nonmembers cooking
The brimhaven Agility Arena.
ok the cheapest way to get 99 smithing is smithing gold ores into bars using goldsmithg gauntlets, so in this way u receive a little bit more xp per bar.
Work your way up to 63 hunter and hunt carnivorous chinchompas until 99 hunter. It's the fastest and easiest way to get 99 hunter and you make a lot of money on the way.
Yes, its a really good way to make money.
If you ask me that would be fletching, otherwise they are all the same, but cheapest has got to be hunter. completely wrong fletching can take months construction is easily the fastest skill taking less then a week easy if you have money, and you can also make more money doing magic then hunter (I made 21M for 91-99). the fastest skills are the most expensive and the cheapest skills are the slowest. this is kind of true but construction is both cheaper and faster then prayer. While you can make money (not a whole lot) doing theiving; there's even a guide to get it from 1-99 in 94 hours. hope this helps