Prest-o-fit patio rug is what we bought.
We got a good deal on it, but it is worth every penny if you're looking for one that won't allow water and sand/mud to come through after a rainy day. My wife and I used it for a 2 month stretch and then sprayed it down with the garden hose...layed it out to dry and then folded it up and put it away for the season. A very good buy in my opinion, but more expensive then the astroturf.
They also make a color matched step wrap that you can attach to the outdoor fold out steps if you wanted to. We have two of those as well and found that we didn't have to sweep out the floors nearly as often as we did without them. Good stuff!
I just checked their website and they do make one that is breathable as well if your area is "anti-mat". For the winter, I'm not sure which one would be better...the aero-weave style that would drain the melt off or the rubber backed mat that won't allow the moisture to come through from the ground. Good luck either way.
Where we've been:
2000 Rockwood Roo M-18 Hybrid
2006 Dodge Ram 2500 Auto 5.9 Diesel
Gone but not forgotten -1986 Rockwood 1003 PUP