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 :
Prism Bath Rug 2-pack | Costco
Costco Edmonton - Leduc] 3'x4' x 3/4" rubber mats for $19.99. FINALLY some cheap mats!! : r/homegym
Costco] Technoflex Athletic Mat 40in x 84in x 0.21in - $29.99 - RedFlagDeals.com Forums
Estate Size Welcome Coir Mat 72" x 36" | Costco
Costco] (COSTCO in-store) Home gym flooring 40" x 84" - 29.99 - RedFlagDeals.com Forums
Costco rubber garage floor mats with diamond pattern. Much cheaper than epoxy. | Rubber flooring, Rubber garage flooring, Garage floor mats
EZ Flex Interlocking Recycled Rubber Floor Tiles by Mats Inc. | Costco
Luxe Therapeutic Floor Mat | Costco
Best Step Interlocking Comfort Flooring
Inspire Fitness FTX Functional Trainer with Bench and 1 Year Centr App Subscription Included | Costco
Traction Premium Rubber Flooring | Costco
Cubii Jr. Seated Elliptical with Built-in Display Monitor and Mat | Costco
Norsk Reversible Multi-Purpose Foam Flooring | Costco Weekender
Cushion Safe Lite Mat | Costco
Everlast Folding Gym Mat | Costco
Apache Mills Treadmill / Elliptical Mat | Costco
Teeter FitSpine X2 Inversion Table | Costco
GelPro Elite Premium Comfort Anti-Fatigue Floor Mat | Costco