www.tyreleader.ie is another one.
www.camskill.co.uk used to be competitive when sterling was cheaper but their delivery to Ireland is something like £19 which makes them less competitive these days compared to the likes of Tyreleader and Oponeo.
Regarding getting them fitted, you will need to ask local tyre fitters but generally with run flats they charge between €10 to €15 a corner. Forget about asking the tyre centre chains like Fastfit, Advanced Pitstop, etc as they won't fit tyres you don't buy from them.