R7S Light Bulb

• https://www.ebay.com/itm/131559002178 - $1.50
• Aliexpress - $3/ea shipping for 11, but holder is only under $1

Holder

• $2.3 in quantity of 25 [1] - 1 month delivery time
• 5 pack - $2.80 ea- [2]

Links

• Heater Pad