RoundFlash Collapsible Magnetic Flash Macro-Portrait Diffuser (45cm) | Ritz Camera
Macro LED Ring Flash, 130D 48 LEDs Macro Ring Flash Light, Macro Photography Light with LCD Display Power Control, 4 Flash Diffusers, 8 Adapter Rings for Nikon Canon Panasonic Olympus Pentax SLR Camera | Wish
Diffuser for MP-E65 and ring flash - www.photomacrography.net
A Comparison of Flash and Diffuser Options for Macro Photography – Martin Belan