Prices of a watched item rising sucks, but isn't surprising really. Knowing market value is important if buying anything with a budget in mind, but it's a test of patience vs need. Watch for a used one, sales, etc. You snooze, you lose though.
Not loading 50BMG here...what would the recovery be on a $60 difference? How many more rounds would have to be pressed to match equiv. factory ammo? Can't be that many.