ZSport via Amazon offers this ZSport 180° Full Face Snorkel Mask in Purple for $19.99. Coupon code "NHC7PF56" cuts that to $15. Plus, Prime members bag free shipping. That's tied with our mention from a week ago as the lowest price we've seen. (It's the best deal now by $12.) It's available in size L only. Deal ends January 31.