Luxurious writing paper and quill

Etsy.com is probably your best bet seeing as no one has popped up with an answer yet

http://www.etsy.com/view_listing.php?listing_id=23210598&ref=sr_gallery_13&&ga_search_query=writing+quill&ga_search_type=all&ga_page=&includes[]=tags&includes[]=title

That's a natural goose quill but if you've never used one before, they take some practise before you can write reasonably, at least in my experience.

http://www.etsy.com/view_listing.php?listing_id=24158445&ref=sr_gallery_1&&ga_search_query=writing+quill&ga_search_type=all&ga_page=&includes[]=tags&includes[]=title

That one has a brass nib like you'd find on a normal fountain pen, for dip ink so you still get the authentic feel.

I didn't see anything in the line of writing paper there though. You could try daintree paper on... Aungier St I think it is. They do wedding invites etc so you can probably pick up a ream of good quality high gsm paper. That or buy sheets of it in the likes of Evans down the road a bit from Jervis St, name of the street escapes me right now.

Neither of which are any use if you're outside Dublin, unless they deliver.