This was posted over a week ago on Amazon for £8.98 (http://www.hotukdeals.com/deals/nerf-rebelle-competition-target-bow-blast-8-98-amazon-free-delivery-10-spend-prime-1946863) which I bought, good value for this money and a good toy but needs supervision not to point at eyes, otherwise does not hurt. Tonight I was in Asda Bletchley Milton Keynes and they had them for £8.50 which I bought 2 of for birthday presents. Cheapest I can find is £13.49 on Amazon now (http://www.amazon.co.uk/Nerf-Rebelle-Competition-Target-Blast/dp/B00EW7TK3U/ref=sr_1_1?ie=UTF8&qid=1405464392&sr=8-1&keywords=nerf+rebelle+star+shot)
Asda also have the Nerf Rebelle Knockout Gallery for £4, cheapest I can find online is £7.49 Toysrus for collection (http://www.toysrus.co.uk/Toys-R-Us/Outdoor-and-Sports/Garden-Toys/Nerf-Rebelle-Knock-Out-Gallery%280116403%29).
Cheapest refill pack is Tesco at the moment - http://www.tesco.com/direct/nerf-rebelle-dart-refill-pack/635-9226.prd?pageLevel=&skuId=635-9226&ui=mercury&sc_cmp=pcp_GSF_Action%20Figures%20%26%20Playsets_635-9226kpid=635-9226&sc_cmp=ppc_g__&gclid=CMDQ5sG0yL8CFcoBwwodz5EAIQ
Should be national? Not on Asda Direct!