re: Solid cake board - non corrugated

What about these? I’ve never used them personally, but Rosie from the blog Sweetapolita endorses them :)
http://www.amazon.com/gp/product/B004G86862/ref=as_li_ss_tl?ie=UTF8&tag=sweetapolit00-20&linkCode=as2&camp=217145&creative=399373&creativeASIN=B004G86862

Becky, North Carolina, http://www.cakesbybecky.blogspot.com