I've personally not seen any UV LEDs in the correct wavelength to use as UV sterilizers. I have seen 9w UV PC bulbs available in PetSmart's pond section. You could use these to DIY, but you'd still have to make sure you use materials that won't be degraded by the UV. Just this part alone would probably make the cost close to, if not more, than just buying one of the commercial 9W ones for ~$70-$80
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