I've looked through every 4th of July mattress deal going and none have stopped me in my tracks quite like this — the Zinus 10" Foam mattress, now just $118 for a queen at Walmart. That's an incredible price drop on a mattress but sizes are selling fast, so don't wait to snap it up.I've slept on a version of the Zinus 10" Memory Foam mattress and it has a soft, sink-in feel that hugs the shoulders and hips to prevent pressure build-up for side sleepers. Admittedly the Zinus probably won't compare to the best mattresses we've tested in terms of durability (and if it's like the one I tested, it'll sleep hot) but this is still excellent value for money.The 4th of July mattress sales will be coming to an end soon so if you have your eye on a deal, there's no time to wait. For me, this Zinus saving is a tough one to beat but if you want more well-priced sleep savings, check out our guide to the best affordable 4th of July mattress sales.Who should consider this Zinus 4th of July mattress deal?It's rare that we recommend beds under $120 for a queen but the Zinus has a few things going for it. First, it's a clearance sale that knocks this mattress to such a low price. And second, we've tested an affordable Zinus mattress and been impressed by the quality. Here's how should being clicking 'add to basket' on this saving:You want a short-term solution for a master bedThe best mattresses in a box can last upwards of six years but the Zinus memory foam bed is unlikely to provide the same level of long-lasting comfort. However, if you need a new bed to get you through the next few years or two (perhaps ahead of a planned move), it's a good pick.I particularly recommend this mattress to side sleepers. Made using similar foams to the Zinus Green Tea Memory Foam mattress I tested, it should provide cushioned pressure relief for side sleepers to prevent sore shoulders. I also expect motion isolation to be excellent (those foams eat up excess movement.)However, there are a few things to note. I predict the edge support will be weak, so don't try sitting on the sides. Also, if it's anything like my Zinus mattress, it's going to heat up in the night.