Try a google search for anything specific you think may fit the niche. For example you could try - silly example but
irish tea towels + affiliate or
"irish tea towels" + affiliate
just add
+affiliate to a search keyphrase. This will only help perhaps with online stuff with affiliate programs but I don't know much about dropshipping so can't help. Perhaps you could try yellow pages for Irish souvenir shops or speciality shops and blarney the owner into giving up her secrets.