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A dash cam is one of those purchases that you hope you'll never have to use, but can prove invaluable should you ever need it. These compact digital cameras usually go on your car's windshield, not the dashboard, where they unobtrusively record a video loop of the road ahead while you drive. Having this video documentation could be the difference between proving your innocence or accepting fault in the event of an accident, potentially saving you money on repairs and insurance premiums.

Besides growing smaller and more feature-rich, dash cams have also gotten much less expensive and -- when you consider the money they can save on vehicle repairs and increased insurance premiums -- they basically pay for themselves after just one fender bender. But that doesn't mean you shouldn't look to save a few bucks more, which is why we've rounded up this year's best dashboard camera deals for Amazon Prime Day. Make sure to check back for updates for new Prime Day deals as they go live over the next day or so.

Vantrue

Ranging from the compact and inexpensive N1 Pro Mini to the S1 boasting up to 4K resolution, Vantrue lists multiple dash cam deals this Prime Day. At the top of the lineup is the Vantrue N4, a three-channel camera system that simultaneously records video from lenses at the front and rear of the car, as well as one aimed inside the cabin -- perfect for Uber and Lyft drivers.

Viofo

A simplified version of the A129 Duo kits that have featured previously on this list, the A129 Pro only uses a single, forward-looking camera. Fortunately, it also boasts a high-resolution 4K sensor and a built-in GPS receiver that stores speed, timestamp and location data to go along with its captured footage.

IIWEY

There are other three-camera systems on this list, but none so affordable as the IIWEY 3 Channel Dash Cam. All three of its cameras boast 1080p sensors, but the camera pointing inward also features IR illumination, boosting vision during the day -- when car cabins are often shaded by the roof -- and at night.

Viofo

With three cameras -- 1440p front, 1080p rear and a 1080p night vision cabin cam -- Viofo's A139 camera system is an excellent choice for rides-hailing service drivers and taxis. It's a bit pricier than most of these dash cam deals, but remember you're getting three cameras for the dough.

Byakov

At around $25, the Byakov Dash Cam is by far the least expensive camera featured during the Prime Day event, but it doesn't skimp on the basics -- packing a 1080p sensor with decent low light sensitivity, a 170-degree lens that offers a wide-angle view of the road and a G-force sensor that, when triggered, automatically saves a video clip of the event.

Toguard

This camera has a strange design, with dual rotating lenses. One features a 4K sensor, the other is 1080p. The benefit is that it lets you monitor both the road ahead and the cabin of the vehicle and choose which is recorded at the higher resolution.

Chortau

A fairly basic 1080p camera with a 170-degree lens, the Chortau Dash Cam's strongest feature is its price. At just over $45 after applying the on-page coupon, it leaves plenty of room in the budget for a quality microSD card -- which you'll need to furnish for most cameras on this list -- and, if you like, a hard-wiring kit that allows it to function even while the vehicle is parked.

Azdome

The Azdome dash cam is integrated into an 11.8-inch display that snaps over the rearview mirror in your car. The kit also includes a remote camera that captures a feed from the rear of the car that can, at the touch of a button, also be displayed when reversing. When not in use, the display reverts to an optical mirror.

Toguard

A more standard design than its sibling above, Toguard 4K Dash Cam captures video at -- you guessed it -- 4K resolution. So, you should have no problem reading license plates and signs in its clips. The price leaves room in the budget for a big microSD card, too. With this many pixels, you're going to need one.

Viofo

The Viofo A129 includes two cameras, a 1080p front camera for the windshield and a second 1080p remote camera that is mounted at the vehicle's rear. The kit also features a built-in GPS receiver that stores speed, timestamp and location data to go along with the synced footage from the two cams.

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