Their system is kind of screwed up, but it ended up working mostly to my advantage.
The sample sale claims a 20% off coupon and $5 shipping, but the coupon has officially expired (as of the 20th) and the $5 shipping came up as $13.50 for me.
HOWEVER, your Sample Sale items show up in your NORMAL KateSpade.com shopping bag, so I called CS and they gave me the 15% off retroactively from the purchase (as it wasn't being applied through the e-mail so they had to charge and refund) AND applied free shipping (as opposed to the alleged $5 from the sample sale), as KateSpade.com is allowing customers free ground shipping on all orders.
If you'd like to make a purchase from KS, I suggest calling because while it's a total waste of time as compared to a traditional online purchase, their website is such a mess it's actually a time (and money) saver.