Came across this and seems like a great deal. They're currently running a Pre-Black Friday special and this is their deal of the day.
They have their pain relief foot sleeves for 50% off at 12.99 and it seems to stack with their buy 3 get 1 free promotion if you use promo code FOOTANGEL at checkout. They also have free shipping.
I've gotten similar foot sleeves in the past and they have worked wonders for my Plantar Fasciitis. I bit and got 4 of them and thought I'd share.