www.thebabywearer.com has an active FSOT board. There's also the babywearing swap on Facebook (although it can be a shark tank). Craigslist is a good source of Ergos as well.
Do be careful buying a used Ergo though as there are lots of counterfeits out there. I would ask for proof of purchase from an authorized Ergo retailer (there's a list on their website) before buying one used. That's not a problem with most carriers but sadly there are many fake Ergos
Re: Where to find used carriers?
I got my Ergo on Craigslist for $50
I just made sure to wait and check often. You can also check the carriers boards on Diaperswappers:
https://www.diaperswappers.com/forum/forumdisplay.php?f=30
www.thebabywearer.com has an active FSOT board. There's also the babywearing swap on Facebook (although it can be a shark tank). Craigslist is a good source of Ergos as well.
Do be careful buying a used Ergo though as there are lots of counterfeits out there. I would ask for proof of purchase from an authorized Ergo retailer (there's a list on their website) before buying one used. That's not a problem with most carriers but sadly there are many fake Ergos
Breastfeeding Counselor with Breastfeeding USA
Babywearing Guide ** Newborn Carriers
Cloth Diaper Guide
Safe Bed Sharing Info