I don't know if any of your LO's are moving up to cots yet at DC. But if they are and you need a napmat I HIGHLY recommend Swankie Blankie Nap mats!
I have done 2 days of research on nap mats and I haven't found any better quality out there. I have found them various prices at different vendors so try online and in store before you buy. The prices vastly differ.