Where do you buy your bird food?

I've gotten really into feeding the birds this past winter, lucky to have loads of them in many different species in our garden. They go thru the food at some rate! I got 25kg of seed for 22euro from newbawn wild bird food in Wexford, which is great and the best value I've found. Anyone know of anywhere that's even better value? Or somewhere to buy seed, peanuts, fat balls etc separately for less? Cheers.