I was shopping at Target last week when I came across this build-a-bed dog bed from Pet Spaces. You have four covers to chose from and either a pillow or this waffle pad, each bought separately. Foyle liked it, and was asleep within a few minutes! Not sure how long they will be in stock but for $10 for each piece it would be worth it to stock up if you can find it.
The bonus part is that the cover also fits the cooler beds! (Chiller beds) This is great because I didn't really want to make two more, now all I need to do is buy a few extra covers!