Had the same problem last spring. Bought a 77RSI in .250 at an auction and then went into the city to get some shells for the next day day, WSS and cabelas, and no joy. Hit the local shop 1st of the week, again,no joy. Found some at a show the next wknd...$35/box. Week later 5 boxes hit the shelf at the local shop...$23.... Its the "new" year for ammo starting now, so you should see some soon.
Best of luck Clint
Side note... If anyone has a varmint load, please send the data