Here are the only 3 AGP HDMI cards that Newegg sells:
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100007709+600007850+600031507&QksAutoSuggestion=&ShowDeactivatedMark=False&Configurator=&IsNodeId=1&Subcategory=48&description=&hisInDesc=&Ntk=&CFG=&SpeTabStoreType=&AdvancedSearch=1&srchInDesc=
As you can see AGP cards are quite expensive. I suggest a new build at this point, otherwise you would be spending money on an obsolete foundation.