I've just posted my Pacerpoles from the UK to my first night's accommodation in Spain at the cost of £12 (keep in mind Pacerpoles are bulkier and heavier than some poles, so it could be less). If I were to check them in for the flights to and from Dublin, and to and from Dublin to Santiago - I would not assume I get it for free, but would pay to check them in before I went - it would cost me a minimum of £20 pr leg, that's £80 or up to £100, which incidentally is the price of the poles. Returning them in the post to myself will cost about the same as here, £12. That's at least £56 saved, approximately €65, which will give me a good couple of days on the Camino. I will also enjoy a stress free travel day as I can take my camino pack into the cabin and keep it with me at all times. My poles are tracked so I will know when they have arrived, which should be in 3-5 days.