If you are planning to build muscle then at some point you are going to need some protein supplements. The Protein Works is a British based online company that offers excellent proprietary products at a fraction of the cost of similar supplements found in health food shops. Their Whey Protein comes in a ton of delicious flavours (or unflavoured for those planning on adding it to a smoothie) and formulations (low carb, high carb, gluton free, vegan etc). You can buy a stand alone kilo for as little as £8.49, but prices fall precipitously the more you buy.
The Protein Works Whey Protein