I'm going to be remodeling the store and going to take down the skins and destroy them soon. So for this week only, all skins are marked between 10L to 25L for single packs. 4 packs are 85L and full packs 500L.
Grab them while you can before there wiped off my inventory!
http://slurl.com/secondlife/Hipparchus/160/210/54/?title=Skin%20Care%20Institute
*UPDATE*
Some skins are marked as low as 8L each now.