Replacement C9 Ceramic Blue Stringlight Bulbs - 4 Pack
Wintergreen Lighting OptiCore C9 LED Blue Faceted Christmas Light Bulbs (25-Pack) 72649 - The Home Depot
25-Pack OptiCore LED C9 Blue Light Bulbs - 0.84W Vintage Christmas Lights Replacement Bulbs Blue LED Christmas Lights Heavy Duty Outdoor Christmas Lights, E17 Base (Blue Smooth) - Amazon.com
LED blue C9 Christmas bulbs faceted, replacement, spare, 25 pack, 120VAC
5 Pack of Blue Smooth Glass C9 LED Bulbs - Novelty Lights Inc
C9 Incandescent Transparent Blue Bulbs
Abeja 25 Pack C9 Blue Replacement Light Bulbs, C9 Christmas Replacement Light Bulb Fits in C9/E17 Intermediate Base for C9 Outdoor String Lights, Candle Lamps, Night Lights - Amazon.com
C9 Blue OptiCore LED Christmas Light Bulbs
LED Plastic Filament Blue C9 Replacement Christmas Lights 25 Pack