Where to find Carboard backing to desks and bookshelves

So that thin, black, cardboard backing on my bookshelf and desk ripped recently and I was wondering if anyone knew where I could purchase another one and just cut to fit?

 

Pick up some Masonite (hardboard) from Lowe's or Depot and shoot it with black paint.

 

+1 on hardboard

it will be a lot stiffer than the crap those things come w/ , ..should stiffen up the bookshelf greatly.. just make sure you drill pilot holes in it for the nails..

 

Can I cut hardboard by scoring it then snapping along the edge, or do I need a fine tooth saw?

 

I would use a sabre/scrollsaw, but you could use a handsaw.

 

what rich said, ..i'd add that it may depend what thickness you can get it in.. i'm used to seeing 3/16", which would probably take way too much scoring, ...i've cut 3/16" pegboard (which is same material) w/ circular saw and jigsaw/reciprocating saw no problem.. for 1/8" score/snap may be viable, just be careful w/ the knife..

 

Does the replacement have to fit into any slots or grooves in order to look and fit correctly? Might be a consideration as to what thickness you can use, just saying.

 

I have seen the hardboard in natural and white. I am sure you can get black.