Reddit reviews IZO All Supply 0.5" Height x 24" Width x 72" Length CentriPUR-US Upholstery Foam Sheet High Density Firm Quailty Cushion Great for DIY Home Décor Seat Padding - Made in USA
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Density: 1.5 , Compression Rate: 44 LB (Firmness) , Resilience = Firm Quailty ( Professional Quailty , Same Foam used in Major Retial Stores ) *****Ideal for Mattresses Padding, Furniture and Bedding Support, Art & Craft ProjectsGood for mattresses, bedding support, and all other home and commercial upholstery applications Uses: ideal for oval and round poker tables, furniture cushions, boat cushions, car cushions, foam mattresses, bedding support etc.Every Foam Sheet is Cut And Made Here In The USA !Perfect for a variety of home and craft projects
>I don't quite understand the difference between open cell and closed cell foam.
Think the difference between a sponge (open cell) and a styrofoam cup (closed cell).
"Pluck Foam" is a pretty popular product for applications like this. Basically it's open-cell foam with a grid cut into it most of the way through the foam pad. This lets you "pluck out" various squares to approximate the shape of the object you're wanting to protect. Commonly used when transporting minis for wargaming.
Not sure you'd find some that thin, though. https://www.amazon.com/SRA-Cases-Pre-Scored-Insert-EN-AC-FG-A019/dp/B00NPWLUHW/ this one is $11 for a bit over a square foot, but it's also 5x thicker than what you're talking about.
Acoustic foam might be closer to what you're wanting, it's certainly in the right price and dimension range, but it's also got that "egg crate" pattern that might be annoying for your purposes. https://www.amazon.com/acoustic-soundproofing-insulation-soundproof-dampening/dp/B076JNCQ39/
Upholstery foam might also be what you're looking for. https://www.amazon.com/Density-Cushion-Replacement-Mattress-Padding/dp/B074TTHFD8/
Was browsing amazon for foam for a work project. https://www.amazon.com/IZO-All-Supply-CentriPUR-US-Upholstery/dp/B074TTHFD8/ref=pd_lpo_sbs_201_img_2?_encoding=UTF8&psc=1&refRID=05GJMK83VEYM6KB5D80F