OptimMore via Amazon offers the OMorc Snorkel 180° Full-Face Diving Mask for $46.99. Coupon code "D8SEG2OZ" drops the price to $38.99. With free shipping, that's a buck under our February mention, $91 off list, and the lowest total price we could find. It features a breathing chamber and is made of silicone and polycarbonate; it's available in sizes S or L.