S3IS - Help with Fish Eye Lens Recommendations

[sugarzebra]

We just bought our son an S3IS for his birthday and he is very interestred in a fish eye lens. I know nothing about lenses for an S3IS and am requesting any help with what to buy. I have checked briefly into Raynox lenses based on searching other threads (they appear to have two different fish eye options). I have also seen a number of lens kits available through eBay, however I tend to avoid these unless someone recommends otherwise.

Any suggestions or experiences with fish eye lenses on an S2 or S3??

Thanks in advance.