GE UltraMax Proline Electronic Ballast, 120/277 Volt Instant Start Ballast, Low Power Ballast Factor, Ballast for Fluorescent Light (3) or (4) Lamp T8, Compatible with F32T8/WM and F17T8 - Electric Plugs - Amazon.com
Philips Advance Optanium 1 or 2-Lamp T8 4 ft. Instant Start Electronic Fluorescent Replacement Ballast 520445 - The Home Depot
GE UltraMax T8 4-Bulb Residential/Commercial Fluorescent Light Ballast in the Ballasts department at Lowes.com
Kihung T8 LED Bulbs 4 Foot, Type B Ballast Bypass, Dual-Ended Power, G13 Base, 24W 3120LM 6000K Daylight White, Compatible with T8 T10 T12 Tubes, 4ft Fluorescent Bulb Replacement, 4-Pack - -
LUXRITE 32-Watt Equivalent 4 ft. Linear Tube T8 LED Light Bulb Ballast & Ballast Bypass Compatible 13W 3000K Soft White (4-Pack) LR34195-4PK - The Home Depot