Note: Commissions are closed. I apologise to people I'd promised commissions to when I was last here; I no longer have the time or resources to make digital art. When I do (next year, maybe?), I'll draw your pictures for free if you still want them
I would say to just Google search "neopets trading forum" and look through the links to find the most active one...
Thanks for the reply! I have done this, but I'd love to hear a testimonial or comment from someone in this community verifying the trustworthiness of any market.