Lighted Walking Cane

I gave my mother a lighted walking cane for Christmas kind of half-joking but half-hoping she would use it. She told me she just loves to use it to go to the bathroom during the night. Now the tiny light bulb burned out and I can't find a replacement at our local lighting store. It is a Xenon bi-pin bulb so I ordered what I thought was the right size at http://www.lightbulbsdirect.com/ but it was too big. After emailing the sales rep back and forth he said to send him a picture so he can try and match it. Now that's customer service for a 2.69 cent bulb!