The wife and I got some great stuff last night to build a production box. We found large sections of black foam board, letter stickers, sticker strips for border decoration, and colorful duct tape for the hinges.

Also lots of other things for other tricks:
Rubberbands
Colored paper for Buddha Money Mystery
Glue sticks
Scissors
Tape
Playing cards
Fans for Snowstorm in China
A nice looking trifle bowl to catch cards for 6 Card Repeat.

We had to draw the line, but we only spent around 30 bucks. There are other things worth looking into there as well.

I'm really enjoying the diy thing lately, this has been a lot of fun.

YES, D Y I -is a lot of fun. Made both the character in profile and a lot of Magic effects.Best to you and yours. Ralph

I remember a few years back the Dollar Store had Jumbo Decks of Cards (2 X poker deck size) that were of reasonable quality and because they are larger than poker (2 X) and smaller than Jumbos, very easy to handle even using standard card moves.

At different times of the year you may come across holiday specific playing cards, too: Christmas, Easter, Valentine's Day etc.

Good ol' Dollar Store

I use the dollar store matching cards for my kid shows. Nice quality for the price.

I remember one time the Dollar Store had a bunch of Criss Angel items. My most practical and actually useable buy was his (flap) card box that would hold a poker size deck of cards AND included his now somewhat collectible deck of cards. What a deal!