Can you just buy snow chains on the way? Driving from Reus/Barcelona to Andorra

Morning car hire co. Generally pretty good. Roads ploughed as snow falls. Only advice i can give is to wear you leave car,in pas if left on street they will tow if snow forcast. Look out for loud hailer on car before snow. Otherwize £150 charge ouch. Other than that enjoy. Mik kent. (Cant beat andorra for skiing). Love it