I hope this helps, my prices are based on sold ponies here and ended auctions on eBay. You may get different prices on Facebook.
Venezuela Squeaky Posey (yellow/white/blue/green) - about $40-60 each
Venezuela haired Posey w/box (green w/ pink hair) - $200-300 I think?
Spain Posey - $15-20 if NC, $25-30 if Spain marked.
Peru Posey - $20-25
Peru Purple hair Posey - not too sure, she's harder to find
Argentina Posey (rehair?) - pop her head off and look to side, if she's a rehair I'd suggest about $40. Not rehaired I'd suggest $70-80
Argentina Baby Posey - $40-45
Mexico Posey (faded hair) - $15-18
Spanish Piggy Pony Peachy - $180ish
Love pkw xxx