TomTop offers these 1080p Mini Camera Glasses for $19.99. Coupon code "SHCG4" drops that to $15.99. With free shipping, that's the lowest price we could find by $5. They feature a 5-megapixel camera and support up to 32GB microSD cards.

Note: This item ships from China and may take up to four weeks to arrive. The countdown timer on the product page does not reflect an actual expiration time and resets daily.

Update: The price has dropped to $15.99. The coupon no longer applies.