Coverguard 5' x 7' Garage Floor Rubber Mat | Costco
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 :
Costco Edmonton - Leduc] 3'x4' x 3/4" rubber mats for $19.99. FINALLY some cheap mats!! : r/homegym