Custom sized boxes?

[CraniumDesigns]

Anyone know where I can buy specially sized boxes for snugly storing my matted photographs?

Say I have 12x16 matted prints and i need a box that's 16.5-17" wide to hold em snugly, where can i get something like that?

 

[Mike A.]

since you are in the SF area try at a few art supply stores or a art warehouse supply. last of all thy a art museum. some one asked me
that awile ago and i told them to check at our local art supply in milwaukee.
just my 10 dollars worth!

mike a.