As one of its daily deals, 13 Deals offers the Swiss Innovation Protect iT Therapeutic Diabetic Socks in Black or White for $9.99. Coupon code "DIABETICDEAL" cuts it to $2.98. With free shipping, that's $21 off list and the lowest total price we could find. They're available in women's sizes from 5-7 to 10-12 and men's sizes from 6-8 to 11-13, although not in all size/color combinations. Deal ends April 22.