Where can I find a 78mm Type J 120 Volt Halogen bulb locally?

My wife found a cute high-intensity halogen desk lamp at the local Goodwill store. It just needs a light bulb. I can order one on-line, but I’d rather pick one up locally. It takes a Type J—78mm 100 watt, 120 volt Halogen Bulb. The true value hardware store just down the street doesn’t carry such bulbs. I’m in downtown Boston, so there are a wide selection of lighting stores and big-box hardware places such as Lowes and Home Depot. But having never shopped for high-intensity halogen bulbs, I’m not sure where to start. If you’ve bought one, where did you get it?