Me too, been there and done that. A few years ago a store in Bozeman, MT had a new Rem. 700 BDL in .222 Rem. for under $500 as I recall and there is no sales tax in Montana. I passed on it once and found it gone the next trip.
There is hope, however. Earlier this summer I bid on a used Rem. 700 Classic in .223 Rem. on GunBroker, woke up in the middle of the night with bidder's remorse, and was relieved to find I had been outbid. The next day I had loser's remorse. Low and behold another pre-owned 700 Classic .223 came up on GB in a few weeks.
This time I took the "Buy Right Now" option as I would be in church during the last few hours of the auction. My final cost was just a couple bucks over my bid on the previous rifle. When I received my "new" rifle, I found out it had never been fired or had a scope mounted. It really was a new rifle.
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Hang in there, learn from your mistakes, and if you are meant to have a .222 it will happen.