For a fixed-power scope, it's tough to beat a Super Sniper in that price range. They have good glass with laser-etched reticle and are durable enough for .50 BMG use.
"None are so hopelessly enslaved as those who falsely believe they are free." -- Goethe
"Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves." -- William Pitt