You could try 1-800-radiator as I remember. They carry metal ones made in Thailand but they are good and with a lifetime warranty. Knowing they are made overseas you can negotiate better prices. Last time I talked to them they try to get you to take it to a recommended shop and stuff so you may not like their new way of trying to do business. I bought on so long ago that they didn't do that. So far I haven't tried to claim a new radiator. Works good and I trust it a whole lot more than a plastic tanks models, even though its about 7 lbs. heavier.

You could try RPR in San Pablo ca. They carry metal ones and in standard and a tropical heavy duty. One more cooling pass I think.

Think they may be cheaper than IPD. They are competitive on stuff.