Deep inner cover how to make and/or where to buy

[NDbeekeeper]

Hi there -
I was wondering if anyone had instructions or knew about a company that sells deep inner covers (like the kind the Nod Apiary products show in their pictures - they don't sell them) I'm finishing getting my hives ready for winter, and need some of these.

Thanks!

[JackM]

you mean something like this?
http://www.bee-outside.com/vivaldiboard.aspx
a telescoping fits right over