Where to buy 6" wooden circle safe for hammys?

[Boo Boo]

I really, really want to make this Fryken house (Ikea hack):

http://www.hamstercentral.com/community/diy-do-yourself-hamster-projects/51865-ikea-hack-diy-round-fryden-house.html

but I need two 6" diameter circles of wood and I have no clue where to buy them. Other than ebay, but are they safe???

HELP!!!

[Spot]

Hobbycraft 6.5 Inch Plywood Circle | Hobbycraft (http://www.hobbycraft.co.uk/hobbycraft-65-inch-plywood-circle/568121-1000) < unsure if this is hamster friendly, and 0.5 out but it in Uk :)

[cypher]

I think some of the glues used with plywood can be toxic for hams so maybe not a good idea.
Could you do it with really thick card or even a few layers glued with non toxic glue?

[BerryWY]

If the wooden disks are unfinished and are not pine, cider, or any real exotic wood it should be safe. However I would not trust any plywood that has glues. Depending where you live you can purchase wooden safe disks from Michael's, Hobby Town, or what I would recommend go to a local wood shop and ask for a wood turner or a carpenter to help you. Or you can go to a High School wood shop! Although sometimes these cost more Its Better to keep your hammy safe.