Here are known sales for the Memorial Day Weekend. Please feel free to add to it in the comments. I manually approve all links.

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Llarowe- Any one item from the website is 49% off with code llarowespringchicken
One day only, from 12:01am MST on May 26th to 12:00am MST May 27th

http://www.shop.llarowe.com

Victorian Disco Cosmetics -25% off all items in the store with code MEMORIALDAY
All weekend, from May 25th to May 27th 11:59pm CST

http://www.victoriandisco.com

MOI Mineral Cosmetics ~ 20% OFF everything in shop with code ( 20offsale ) Starts Saturday Morning May26th- Midnight Monday May28th Atlantic Time

http://www.moicosmetics.com

Sally’s Beauty- 50% off of all red tag clearance products in store and online. Online use code 555100
May 25th – May 28th

http://www.sallybeauty.com/

For Goodness Grape-
Use coupon code STARTSUMMERTODAY to save 15% off on your entire order.
www.ForGoodnessGrape.com
www.ForGoodnessGrape.Etsy.com

Cherry Culture- Enter code MDS12 for 20% off anything in the store.
Now thru May 28th

http://www.cherryculture.com/index.php

Moon Rabbit Cosmetics – 15% off using code JBLC15
Now thru 31st
moonrabbitcosmetics.storenvy.com

Dorian + Dahl Perfumery-
get 15% off! Use the code, SNAILSSILVOUSPLAIT when you go to checkout!
Now until Tuesday!

http://www.etsy.com/shop/doriananddahl

Evil Shades- Code YNOT20 for 20% your purchase!
http://evilshades.com/

Meow Cosmetics
20% Off – Code: AFewGoodCats
http://meowcosmetics.com/

Cult Nails
Pre-Sale Fairy Tales Collection Event
Get all 5 colors for $40
http://shop.cultnails.com/