I would like to put an FDIC Logo "sticker" on our white boards used in our branches. Does anyone know where I can order a small sticker for these boards?

Don't know where to get an official sticker, but you'd be just as well off printing out a logo (find one in the toolbox on this site)on your office printer and then copying it onto sticker paper at your local kinko's. Total solution cost would be less than $1.

Check to see if your white board is magnetized. If so, you can affix a magnet on the back of a paper copy of the logo and stick it on.

I had this done at my old bank. I think they took Avery type stickers and ran them through a printer, put them in the lower corner and went about their business confident I would stop in the in-store branch at 8 PM and say "hey, where is your Member FDIC disclosure?"

Just be certain they don't also advertise NDIPs.

Official Signage can be ordered from the FDIC.
They do have signs that are stickers.
Order FDIC Signs

Those will be the official 3x7 gold and black signs and will take up more space than may be necessary or desired.