First post so sorry if I missed something:
Just been to my local tesco (Chorley) and all their life jackets are half price.
Range from kids 10 - 20 Kg, 20-30Kg and aduts 70-80Kg, 90+Kg
Not sure if this is UK wide, but certainly a cracking price.
Full price still online, but put link it to show what they are like.
Adult ones are blue.