Well the Stofen Ombi-bounce is cheap and works just fine..
The lumiquest products are great, though on the flash they are huge.. Only problem with them is they aren't omni-directional.
I havent used the gary fong stuff before, but I will be soon, so I'll let you know!
These are the only ones I've used.

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but I think sometimes the easy/simple solutions work well for what you need. I myself use the stofen omnibounce.
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