Tell us a bit more, do you care about quality or cost? Where are you at? US? Europe?
From my research so far and my purchases...
http://store.frontlinegaming.org/2gaming-matsFrontline mats are thick, good grip to the table, the image on them is nice, water/spill proof and to me a good investment. I down two, the green and white winter one....they are very eye catching, easy to store. The cost is $100 US and I think about $10 shipping if I recall right...I know they got distributors in Europe. If you are in Europe I can suggest another company the overseas shipping was rough but the price and product quality was the same from my research.
http://www.deepcutstudio.com/category/mats-size-4-x6Been looking next at Deep cut Studios (I am a mat hoe) (not really, I just run Bolt Action events so I want more mats for tables and looking for a cheaper price).
Roughly they are about $60 US, but if you order multiple you save on shipping which is huge to me if you are buying more than one at a go. They have several options that can work IMO.
Check out my blog dice of legends and you can see setups I have done with the two FAT Mats I own...