Where was I? Oh yes, light boxes.
Anyway, if you've got the cash, I'd recommend the Artograph LightTracer Light Box available in many online stores. It's a great portable light box and the 18" x 12" size is perfect for your animating needs but retails for $89.99. There is an Artograph LightTracer that is 10X12" $44.09 at this writing. But I think it's too small for standard 12 field animation paper. It's hard to find these in stores so you'll have to order them online but then there's shipping and all that implies.
As an alternative, may I suggest checking out your local hardware store, they might have everything you need to make your own light box for a much lower cost with no buying or cutting of wood necessary . These are the supplies you need below:
11 liter clear box. I got mine at OSH, my favorite hardward store. It's a sturdy and durable 16x14" box that has a depth of 3.5".
peg bar in to.
The second item (but labeled #4...whatever) is simply a sheet of aluminum foil to act as a reflector of your light source. You can get foil anywhere and I'm sure you have some in your kitchen somewhere, when you're not using it to wrap up your head, you can pull out a length about as long as the box and put it it in.
No heads were wrapped in the making of this post.
Next, you'll need something like 2) a portable light socket. The one I purchased has a 4 foot cord attached and on/off click switch. These are usually about 5 bucks.7 watt TCP LED bulb. You can also get a higher wattage bulb if you'd like.
extension cord. You probably have one of these laying around anyway. I remember my grandmother had like 2000 of these things, so pay a visit to a loved one and sneak one of theirs. Purchase price goes up two bucks, so we're at $24 not including tax.
dimmer switch. These are expensive but after animating for a while, the dimmer comes in handy and your eyes will thank you for it. Now, we're talking $15 more so it may be getting into a "just buy a light box from above" kind of price range but again, the choice is yours.
Though the box is functional, it's still a box...and not very ergonomic.
Really Useful Box!
Now go get animating, and thanks for stopping by!