Welcome back!
LSPP doesn't come up often, in my experience, so I'm not sure about her. I actually just got incredibly lucky and BIN'ed her for $25.
I paid around $150-180 (can't remember exactly) for my MIP Bay Breeze about eight years ago and a similar price for a loose Rosey Posey around the same time. Values have been down but are increasing with childhood G3 lovers reaching adulthood and entering the collecting community.
First 50 ponies are going for $30-40, more for the first six from 2003. I paid around $60-70 for Kimono last year.
I paid $40 for MIP Black Project Pony a few months ago, again, a lucky eBay find. I probably paid three times that amount for her loose around 2011-2012. There are currently several listed on eBay that have been there for awhile, but that could also be due to COVID-19 income loss.