Found 24th Dec 2016
xshot 100 dart refill pack reduced to £3 from £10 in store at Tesco. This was in the St Helens store but a quick google shows several other stores have them at this price also. not available online so might be bit of a goose chase, but worth looking if you happen to be visiting your local Tesco. seems to be £8 - £12 everywhere else.