This may already have been brought to your attention but today Lidl's have loads of running gear. V neck T shirts and vest tops, 3/4 leggings with back zip pocket. Running belt with bottle, insoles, watches. They also have trainers not sure if I would run in them but they looked really good for £14.99.
I've bought Lidl running gear in the past and all of it has been excellent, their stuff sells very quickly though.