Tom's Hardware usually has a link to daily deals over at LogicBuy which is a service that checks for lowest prices on the net. The link is located in the News Section on the left hand side of the home page. LogicBuy has a web page just for drives:http://www.logicbuy.com/categorydeals/computers/hard-drives-ssd
The prices, brands, and models change daily. If you have a particular brand and model you are interested in you have to be patient and check twice a day. A couple of months ago I waited two weeks to get a Samsung 830 SATA 3 6Gb/s 256GB ssd for $209.00 and free shipping. recently I saw it for $199.00. The Crucial m4 SATA 3 6Gb/s 256GB ssd went for $159.00 and free shipping. It sold out fast. I've also seen 120GB ssd's drop down to $59.00. You never know what might become available.