A fellow board member here named Katkuru sells cathode lightsabers that plug into a wall. You don't want the battery powered ones on eBay, they are dim. The cathode sabers are bright. And they last long. On weekends, I sometimes leave them on all day/night. I've had mine for awhile now and they are very bright. He sells them also at a very modest price, fully assembled for board members.
I would say that's the way to go.
For me though, I just hate to have to hide the wire and deal with transformer box and find proximity to a plug. It's cool if you're gonna leave it stand somewhere that can hide all that but my figs are just on glass in the open so its problematic.