Air & Foam Camping Mattress, Self-Inflating Sleeping Pad

Exped is awesome, but OP might save some money by going with a knock off, like Lost Horizon. I've slept on both and didn't notice any meaningful difference in quality. https://www.amazon.com/LOSTHORIZON-Camping-Mattress-Self-Inflating-Sleeping/dp/B0DSVSXGHG?th=1.

Since you're just planning to car camp, and not backpack, then get a self-inflating foam camping mattress. You can get the Lost Horizon on Amazon in the Single Slim size 62"L x 26"W x 3"T

Exped is the current king of the semi self inflating mattresses but there are other worthy considerations which are more affordable, especially on sale. I went with a Lost Horizon I found on clearance for half price. Probably not as bomb proof as the Exped, but after about a dozen trips this summer it’s going strong without issues. The bottom line is these type of mattresses are exponentially more comfortable than anything else on the market. I will never go back. The only drawback is they don’t roll up small.

4 inch inflatable foam mattress, a double works for two people lying basically side by side which means not a lot of room to move. So if you move quite a bit in your sleep you probably want a double + single or even two doubles, but that also means you need a larger tent. On a budget you’re probably looking at Lost Horizon or Hikenture (both available on Amazon), and likely at the pump sack versions. If you have time and can wait for a shipment, you can try Mountainhiker on AliExpress, a double with the air pump ranges from $110-130, check different shops for the best price.

This one was a bit out of my price range but I bought one on Amazon by a brand called lost horizon. I feels the same and it’s about half the price. It’s gone on a few adventures with me.

Lost Horizon is great for cold camping, they'll stay fully inflated at below freezing, but you do need a pump to deflate it properly, still the most comfortable camp mattress I've laid on

Goto REI and try a few out! "Self inflating" is a little misleading, as you might still want to blow a few breaths into it to fill it to your comfort level. Klymit are pretty thin and lightweight which are good for backpacking. I've got a CORE brand mattress that is working for me in my RTT. I had a Lost Horizon brand off Amazon but it ended up developing a leak and their Customer Support was unreasonable to deal with so I tossed it. I've heard NEST are super comfy so check them out too.