Nutrition prices are absolutely nuts. I've been looking at solid bar options and all the cycling specific ones are in the region of £5-6/hour if you're targeting 80-100g of carbs. I've bought some more Nakd bars and will just mix up my own drinks (combination of caster sugar and maltodextrin giving a 1:0.8 mix of glucose and fructose).
Its mad what people will pay. On cycling reddit people are raving about Skratch. Its ~£40 for 840g. That could be pushing £10 on a longer ride. Madness.