Groupon offers the Garmin Head-Up Plus Windshield Projection Display for $74.99. Coupon code "SALE10" drops it to $67.49. With free shipping, that's $8 under our mention from two weeks ago and the lowest total price we've seen. (It's also a current low by $19.) This projector connects to your smartphone to receive driving directions and project them onto your windshield. Deal ends December 30.