Alexander, here is the link for these bulbs,
http://www.replacementlightbulbs.com/lampejl.html.
I agree with Thomas, spares are important and I usually get them even if it's only to make the most of shipping fees.
Off-hand, his $2.50 bulbs sounds like a better deal than the above, but they have given good service and provided difficult to find items each time I've needed them. They are certainly better prices than what the camera stores are asking. I don't mind paying a premium to an online store that is well stocked and provides film users with real value through quality items, but the usual places I shop at are asking $20 plus dollars for these bulbs and that is just outrageous in light of what they cost elsewhere.
Perhaps a sticky for this link and other bulb sources might help others and if the camera store lose the business, maybe they'll rethink gouging the folks keeping them in business.
Eli