Philips Advance AmbiStar 32-Watt (F32T8) 3 to 4 Lamp 4 ft. T8 120-Volt Instant Start Electronic Fluorescent Replacement Ballast 520379 - The Home Depot
GE Lighting UltraStart Proline Electronic Ballast, 120/277 Volt Program/Rapid Start Ballast, Normal Ballast Factor, Ballast for Fluorescent Light (1) or (2) Lamp T12, Power Current Equipment - Amazon Canada
Rapid Start Ballast Tombstone - Electrical 101
Philips Advance AmbiStar 40-Watt (F40T12) 2 Lamp 4 ft. T12 120-Volt Rapid Start High Frequency Electronic Replacement Ballast 520395 - The Home Depot