You'll have to check the net... and buy in bulk (cases at a time.)

But consider other cost factors that can easily be bigger than the
bulb:
1. Electricity is about 90% of the cost of lighting. Dimmers, timers
and energy efficient bulbs will save big bucks.
2. Do not use long life bulbs. They are LESS efficient so you don't
save money unless you are paying someone to change the bulbs.
3. Consider fluorescent bulbs!! Just try some for a while and find a
brand/size you like. They are NOT all the same.

Richard Reid, LC
Luminous Views

wrote:
The best I've found locally is $2.50/bulb, and that's in multi-packs.
We have alot of recessed lights, and I wish I could find a cheaper
source for these.