Amazon, where we got ours, sells the 24x18:
http://www.amazon.com/Gaiam-All-Natural-Cork-Bath-Mat/sim/B000O1YSIU/2
For the 36x24:
http://www.gardeners.com/Cork-Bath-Mat/NewFortheHome_Cat,37-834,default,cp.html
Should it happen to be a bonus for anyone, it may be the world's first all-natural and recycled (old wine corks) room treatment ;).
http://www.amazon.com/Gaiam-All-Natural-Cork-Bath-Mat/sim/B000O1YSIU/2
For the 36x24:
http://www.gardeners.com/Cork-Bath-Mat/NewFortheHome_Cat,37-834,default,cp.html
Should it happen to be a bonus for anyone, it may be the world's first all-natural and recycled (old wine corks) room treatment ;).