I think you'd have to do some browsing & reading
http://www.digikey.com/catalog/en/search?filters=19270
or, regular search for pushbutton, filtered for thru hole, sorted for lowest price:
http://www.digikey.com/product-search/en?FV=fff40011%2Cfff80061%2C1140050&k=pushbutton&mnonly=0&newproducts=0&ColumnSort=1000011&page=1&stock=1&pbfree=0&rohs=0&quantity=&ptm=0&fid=0&pageSize=25