Walmart offers the Pyle 7" Mirror Monitor w/ Backup Camera for $40.43. Choose in-store pickup to drop it to $39.18. (Amazon charges the same for Prime members only.) That's a buck below last week's mention and the lowest price we've seen. (It's the best deal now by $9.) It includes a nightvision-capable rear view camera and clips on to your rear view mirror. The mirror features multiple video inputs for additional devices.