I'm with Rachel - I'll always credit a lampworker, cos their skills are flippin' amazing! But I don't divulge supplier information on anything else. I might privately share supplier information with a fellow jewellery maker with whom I've built a personal relationship, but not in "public" - I spend a LOT of time researching & sourcing my materials, so I figure everyone else can put the legwork in too & not just rely on me to provide them with the shortcut

Additionally, if I credit the lampworker, the nosy folk will go check them out & realise that the single bead cost me £20, so my price isn't actually *that* huge for the finished product! lol
I've never heard of East of India, but I'm guessing that it's going to be recognisable by those who know of it? That being the case, you might want to add something say on your blog/facebook page in a conversational manner - e.g. "look at this amazing EoI ribbon I bought - doesn't it look fantastic in my *insert item name here*?"