Check with your local doctor who does hearing issues or medical supply. 
Seems thats a rather common problem. Also check your local electrical 
(commercial/industrial) supply house, strobes are used for emergency 
evacuate alarms in buildings.

Vitaliy wrote:
> Is there an off-the-shelf solution for a doorbell that uses light and maybe 
> even emits a loud sound? Preferably wireless, and easy to install by a 
> non-professional.
>
> Thought I'd check, before hooking up a strobe to a Walmart doorbell. :) 
>   
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