I was going to post this as a new thread, but since there already are a few of them, I'll post it here.
This isn't the most colorful solution, but it works well for what I wanted to do.
A few months ago I purchased the Nu-Dell
message board with letters, 24"x36", black from ReStockIt.com (
https://www.restockit.com/Message-Board-WLetters-24x36-Black-(NUD52436).html?prd=1) for $72 (free shipping) (FYI, looks like the price just went up to $74). It came with 288 letters each in 1", 3/4" and 1/2" sizes. I used the 1" letters at the top and 3/4" letters & numbers for the rest of it. There is space for 35 game titles on this board using the 3/4" letters.
Obviously, what's included doesn't have nearly enough letters and numbers to populate the entire board (after Galaga, Dig Dug and Frogger, you are out of Gs!). I ran out about a quarter of the way through and ended up buying a 6-pack of the Nu-Dell
White Letter & Number - 3/4" (
http://www.instawares.com/white-letter-and-number-34.50150.0.7.htm) from Instawares.com for $55 (free shipping). Yeah, it's kind of ridiculous for little pieces of plastic. Anyway, each set has 144 letters and numbers (and it comes with 6 sets). You can use the letter O in place of zero since they give you more of the letters. UPDATE: I've since had to buy *another* package of just numbers because I ran out of several numbers after opening all 6 of the letter/number packages I bought before.
I bought the letter organizer container at Michael's craft store for about $8 (it's a craft/bead organizer with 32 bins). The photo shows multiple sets of 3/4" letters & numbers in there.
By the way, I don't own all of these dedicated games. Most are in multiple-game systems (Ultimate Arcade 2 and a 60-in-1 game).