Here's a list of $50 - $75 cases off Newegg:
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2010090007+4026+1054808287+1295819209+1055508421&QksAutoSuggestion=&Configurator=&Subcategory=7&description=&Ntk=&CFG=&SpeTabStoreType=&srchInDesc=