Many who purchase aftermarket shocks sell the stock shock on eBay. I know I did!!!
I got $85 for mine and it actually went to a guy in Germany. He was in the same situation as you and wanted stock.
I installed a Progressive Suspension shock on my bike. Unless you're, Ummm, hefty, don't go with Progressive as the spring rate's very high..
I remember a guy on another site who sent his stock shock to a guy in Ontario and had it rebuilt, but I don't know if he actually saved any money when he did that, and that was when the Canadian dollar was worth around half of what it is today..
There's several other aftermarket shocks available, and they could be built for your size and riding style, but I don't know if you're interested in spending more for a shock than you did for the bike.
Keep an eye on eBay. I think you'll find your pogo effect will be gone and you'll enjoy the bike. I'd change out the fork oil at the same time, too.