I wrote to a few ramp sellers (who I have no experience with) and heard back from both. This one appears to be cheaper:
LedgeRock Farm
They sell 1 lb at $10/lb, but the best price is $9/lb at 3 pounds ($27) (not sure why they charge more per pound for 4 or 5 pounds). I asked them how many per pound and they got back to me that it's generally between about 30-50 bulbs/pound. So at the 3 lbs price that's conservatively about 27 cents per bulb plus shipping....not bad!