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 :
GorillaCOR™ - Rolls | Perfect Surfaces Shop
G-Floor 7.5 x 17ft (2.3 x 5.2M) Floor Protector | Costco UK | Flooring, G floor, Durable flooring
Garage Flooring | Costco
Garage Flooring | Costco
Coverguard 3' x 15' XL Garage Floor Rubber Mat | Costco
G-Floor Slate Grey Coin Tread Roll Out Flooring, 8.5 ft. × 24 ft. | Costco
Garage Flooring | Costco
Ultralock Black Perforated Garage Tiles | Costco
Revêtements pour le plancher du garage : lequel choisir? | RONA