The problem is that whilst some $2 store and others have small packs of replacement bulbs, for around $5 places like Pak N Save have a string of 50 lights.

Look like miniature capless. Can you straighten the lead out and pull the bulb out of the white holder?

Will try when I get there, ATM all I've got is an emailed photo.  Apparently they're Ikea Kläkkänblängän or something, but sourcing those locally just brought up meatballs.

k1w1k1d:

Look like miniature capless. Can you straighten the lead out and pull the bulb out of the white holder?

Got some further measurements, the whole thing is powered by a 24VDC power supply, there are several chains of around a dozen bulbs each, 70mA on each chain, so I'm guessing 2V 70mA grain-of-wheat bulbs.  The white/clear plastic bit to the left of the bulb is a friction-fit holder so you can pull the bulbs out of that and replace them, it'll just be a case of sourcing the right bulbs.