Also check Donedeal.ie and adverts.ie regularly, bargains pop up now and again.
Start thinking about what model you'd like as well, huge difference in ability between boats. E.g. you'd be better off with a 4, 5 year old P&H or North Shore etc than a newer Venture.
If I ever get back on the water you can try my Kayman, I'll tempt you away from plastic!