Clear pockets in an A4 file is the cheapest. there are a few recipe holder products around from Amazon and the like that have flip over pockets in a wire ring or have 'recipes' printed on the front of a folder, but a DIY version is cheapest.
If you really want to get organised, use one of the recipe programmes for the pc - Bigoven is one to buy or Recipe Center is a free download. This sorts by quantities, you can import from other sites and arrange according to your requirements, print menus etc etc. Have a look at this as an option -
http://www.recipecentersoftware.com as it might be handy.