Thrift shops hide ugly old corkboards behind frames and artwork, so dig deep! Most of the time I find really ugly corkboards for about $1.50 and craft foam in the discount stores or hobby shops for a few dollars a bundle. The craft foam in my project measured 6" x 9" and I used 15 sheets each to do two corkboards, each board about 22" x 33", give or take.
On one board I used wood glue and the other I used Elmers and they both worked just fine.
It's really a fast project, can be done with kids and you just can't mess this up - plus, it keeps a corkboard out of the landfill and makes it pretty again!