I've been shopping Amazon's Black Friday cheap mattress sale and these are the 4 I'd buy

1. Casper Sleep Element: from $395 $335.74 at Amazon
The Casper Sleep Element is a medium-firm mattress made with breathable flex foam layer for full body comfort, all topped off by a soft knit cover. It suits most sleeping positions and promises to help keep your body in healthy alignment during your sleep. Additional benefits include the 100-night sleep trial and a standard 10-year warranty. You can now save up to 15% on a queen sized bed lowering the MSRP from $595 to $505.74 on Amazon.

2. Zinus Green Tea Memory Foam: from $104.99 $89 at Amazon
This is the cheapest model on our round up with a twin size of the 6" model starting at just $89 in the current Black Friday sales. Aside from the incredibly affordable price, the top memory foam layer of this three layer foam mattress features green tea infusions, while the other two layers are made up of comfort foam and a base foam layer. When we tested the 10" version of the Zinus Green Tea Memory Foam mattress we rated is its 'sink in' softness and soothing pressure relief, making it ideal for side sleepers. It is good to note that the current Black Friday deals are only available for three sizes (full, king and twin) of the 6" model and for the king size of the 8" model and queen size of the 12" model . A queen sized 6" Zinus Green Tea Memory Foam mattress now has 19% off the original MSRP of $158.83, making it just $129.

3. Nectar Gel Memory Foam: from $499 $296.65 at Amazon
Nectar is another well-known brand featured in our best memory foam mattress guide, and this Black Friday sees huge savings on the brand's mattresses on Amazon. A twin sized Nectar Gel Memory Foam mattress is now available for less than $300. This affordable, easy-to-setup mattress in a box provides five layers including a breathable, heat-wicking cover and a gel memory foam layer. The current Black Friday deal is the cheapest we have seen all year for Nectar on Amazon. A queen sized mattress is now 39% off, dropping the MSRP from $899 to $551.65.

4. Siena Memory Foam Mattress: from $199 $169.15 at Amazon
The Siena Memory Foam mattress is our best cheap mattress, thanks to its support for back and stomach sleepers at an incredible evergreen sale price of $399 for a queen. However, you can buy a queen for $339.15 when buying from Amazon right now - that's the lowest price of the year. Our Siena Memory Foam mattress review details how we found it to be firmer than advertised, placing at it 9/10 for firmness. You can expect decent temperature regulation and good motion isolation, so a safe bet for hot sleepers who share a bed and want firm support.