I currently have RSed 19/100 Neocola Tokens, in three days. Not that hard.
Oh and I forgot one thing: always do your dailies. I didn't include them in my small guide because you can never rely on them... but remember, if you get something like a faerie paint brush from the Fruit Machine, its 700k+ in one day
I think SW is the easiest shop to RS, and you can always try snow food (ice lollies and magical chia pops), faerie foods (faerie mushrooms and loads of other junk, look it up on neoitems), and as Setekh mentioned (sp), card shop. Although you'd have to rely heavily on r99s for that shop if you want real profit, its still worth a shot. Oh, and you can also get the avatar cards from that shop... heh.
As for the stock market, buy at 15. I usually sell at 20 because I'm impacient, but you can always wait and see if your stocks rise.
http://www.neopets.com/guilds/guild.pht ... ck_benefit this guild is pretty helpful.