OutdoorMaster 180° GoPro Compatible Full Face Snorkel Mask $10 at Amazon
Amazon with OutdoorMaster has the OutdoorMaster 180° GoPro Compatible Full Face Snorkel Mask (L/XL Classic, Black or L/XL GoPro Edition, Pitch Black) for $40 - $30 off with code
SNORKEL75 at checkout =
$10 with free shipping on $25+ or with Prime.
Original Source of Info