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Aldi do a really solid range of cycling friendly food. Pressed fruit ones are super cheap, and also vegan protein bars for 50p ('Hike' ones). It's an absolute god send for whole foods, similar price for nuts etc to my local pay-by-weight wholefoods shop. Also sell proper peanut butter, and cheap flax/linseed, soy milk, almond milk etc. They just need to start selling tofu...
(I realise it sounds like I work for them or something - I don't.)
@gabes suggested fruit press bars from Aldi. Much like Nakd bars but a whole lot cheaper...would def recommend