Though I'm sure OP has already received his mat, I wanted to share what I've been using.
Find a bar supply store, or man cave type store in your city and find a "bar spill mat".
The non branded ones go for a couple of bucks, 10, tops.
https://www.google.ca/search?q=bar+spil ... 20&bih=971
You need to be working with tweezers, but never have to worry about dropped pins wandering off etc.
JW