When it comes to Shrek costumes, there are so many choices. You can really surprise your friends with a Shrek the Third Gingerbread Man costume. Shrek and Fiona costumes make a great couples Halloween costume. Buy some Shrek ears, put on some green Halloween makeup, wear green clothes and you have your own discount Shrek costume! With a set of Fiona ears, wig and tiara you can wear any fancy long gown and green makeup and you just created your own discount Fiona Halloween costume! Any donkey costume can be altered slightly to create your own Shrek Donkey costume.A good place to get a discount Shrek costume is at eBay. Some sellers offer free shipping. Here are some of today’s eBay listings for a Shrek Halloween costume: