It's a lot cheaper if you can buy in bulk (we have an extra freezer in the garage just for dog food), I spend around £80 with a raw supplier which lasts about 2 months for 2 cocker spaniels. I don't just stick to one brand, they get a mix of cheaper and pricier ones to make the money go a bit further. It often ends up cheaper than some of the mid range/high end kibbles/wet foods plus you're getting pure meat (if you're a prey model feeder rather than BARF which includes fruits/veg/herbs) with no crappy fillers like rice, potato, maize, soybean etc.
If you're looking at brands, Bulmer, Durham Animal Feeds (DAF), Thistle Raw Feeds are some of the cheaper complete brands. Furry Feasts, Manifold Valley Meats (MVM), The Dogs Butcher, Nurture Them Naturally, The Raw Factory, Landywoods, Natural Instinct are more mid range. Paleo Ridge, The Dog and Bones, Benyfit, Nutriment, Henley are more expensive. I've tried quite a few different ones over the years! Nature's Menu is okay (the only raw brand stocked in Pets At Home) but very expensive for what it is, and some of their products contain rice so that's best avoided.
You can get thrifty once you're familiar with raw feeding - some people manage to get hold of some extremely cheap discounted meat in shops or offcuts from a butcher for next to nothing. I'd recommend joining some raw feeding groups on Facebook like Rawfeeding Rebels or Raw Feeding UK - they're always willing to help newbies and answer any questions.