I got it in a supermarket in cork on a fishing holiday last year, I think it cost me about 3.99 and it's a bag of about 50 metres of tubing which make great bait stops and slip knots for rig making.
Two pieces of this stuff, which I didn't find as good, were costing about the same price as this lot in the tackle shop.
I've not had a slip knot fail yet and I reuse rig bodies a few times, they reset no problem on 60lb rig body.
There's a link called distribution list on the site which links to the UK/IRL distributor.