don't know if this was asked before... but I'm looking for someone that'll sell it retail, even if it's online... I found some wholesalers but no luck
I've never thought of glow in the dark yarn, although now that I'm intrigued, it'd be great to knit into children's designs!
http://www.etsy.com/view_listing.php?listing_id=19279151 It's the only glow in the dark I've seen... it'll cost you an arm and leg.