Costco (in Canada at least) has these sweet rubber mats that remind me of the gym. Way cheaper than Amazon since they are heavy as heck! It's flat on the other side :
Eckhert Kids Double Sided Play Mat | Costco
Tuxmat at Costco 🇨🇦 (Phantom Mat) | F150gen14 -- 2021+ Ford F-150, Tremor, Raptor Forum (14th Gen) | News, Owners, Community, Discussions
3D MAXpider floor mats on sale at Costco.ca for $129.99 - Drive Tesla