I will see if I can get some for you.
A couple of tips.
Taper the ends of the dowels. Makes it easier to get them in place.
Caulk and tape all of the joints for a good seal.
Put a floor in the chamber. The foam dents and tears easily. I used the stuff that looks like masonite with a shiny white surface on one side.
Use the round water bottles like these. http://www.amazon.com/dp/B003QDANZK/...K&linkCode=asn
You can stack three high on each side to really get the temps low.