If you're in Payon, head to the east side of town until you find this guy.
Tree roots drop from Willows and jellopies are extremely easy to obtain from Porings, Drops, ChonChons, and Skeletons. Other players usually just leave these on the ground, so go hunt some Porings on populated maps and you'll find they've picked up all sorts of things.
You can also get red potions for 10 jellopies and carrots for 3 jellopies in Alberta.
There's another way to get red potions, but it costs a tiny bit of zeny. Go to the merchant guild in Alberta, which is the southwest corner of town.
Head inside and take the door on the right and you'll see this guy. He'll trade you herbs and bottles and a few zeny to make various potions.
There an NPC in southwest Geffen that collects shells, jellopies, and chrysalises in exchange for red potions.
And also an NPC in south Alde Baron that will exchange worm peelings, feathers of bird, and jellopies.
It's a bit more labor intensive from picking up all those items and collecting herbs, but it's totally worth it if you're broke as heck!
Edited by SisterGoat, 09 August 2012 - 09:23 PM.