Dultmier has that pump for $428 and rittenhouse has it for $426.50 www.rittenhouse.ca
Rittenhouse has a parts breakdown for this pump.
Did you freeze the unit? New pump body is $113.50 for this pump........Why don't you just fix the pump as they are simple to repair and easy to get parts for. Hope this helps.
I think that's what heritage meant by freeze up was that it locked up. I was going to suggest Dultmeier or there is a company out of Minnesota that sells the Hypros as well but I can't think of the name right now. Agrochem carries Hypor as well, their web is www.agrochem.com or 1-800-438-4489. Good Luck!