Oh such cuties!
Gosh yes Oakly has dropped significantly in price - 12 months or so ago he was a $120+ pony friend. If I was selling I would pop him around the $75-80 mark although at $60 he will be snapped up.
Lovebeam - always the least popular of the Colorswirls for some reason - but like the rest of the set they have actually gone up in price recently
I would say $30-32 for her minty; with the issues $20 (the marks can probably be sunfaded but its still quite a big stain and a risk that it wont come off completely).