as what, plate?
In general 625 and C276 have very similar prices, about 8-9x the 304 price.
Alloy 20 and 904L are used very little, so they are more expensive than the alloy content would indicate.
At todays Ni and Mo prices 316 is about 1.4x the 304 price (hence the move to lean duplex grades in place of 316).