Hmm.. I did fine with D Squares or Whips will do fine too .. But I heard a large amount of chaos runes is very good too Sell again in F2P or something ! Keep Searching
Limps are very good buy 100-200ea in non-members world 1 and in world 2 fally or forums re-sel 800-1.2kea, very good profit.
so how much u planning to earn per day? if 2m+ merchant chaos,deaths,nats, and bloods from magic guild...just keep switching worlds and buying...it doesn seem like u make much but after u get done buying 1.5-2m in runes go sell in world 2 and u will make 400-500k easy in 1-2 hours~GL!
Buy minds in a world 1 (15-20 ea depending on current market) and sell them on the forums for 5gp more than you paid. Buy nats for 300 ea on the forums and resell them for 320 ea in world 2 and on the forums. Easy. Buy and sell rune boots. No clue on current market. Buy rannars for 6k ea and sell them for 7k ea Buy unids for 1k ea, id 1 of each stack, sell rannars 7k ea, sell snap dragons, sell the rest as unids over 25 for 2k ea and sell the low level unids to some noobs for 1k ea.
I find a good way to make money is just to buy yews in huge bulks 330 each and bs for 200 each and string then sell for like 600 each pretty good profit in there. May take a while but good for fletching, kill two birds with one stone eh?