Newegg.com has the 500GB Samsung 850 EVO 2.5" Internal Solid State Drive SSD (MZ-75E500B/AM) on sale for $189.99 - $19 promo code EMCARAT22 (apply at checkout) = $170.99. EggSaver Shipping is $2.99.
In my case, I had a $25 gift card from Christmas, so I got mine for $150.98 shipped (I went to three day shipping instead of EggSaver, which I loathe). The 850 EVO has a five-year warranty, which is a huge plus. My desktop is going to get this as its boot drive, making it the last system in the house to get an SSD.