Which capacity? 64GB, 128GB, 256GB, or some other capacity?
Which type - SATA 3 6Gb/s, mSATA, M.2 NGFF, or a PCIe ssd?
If you are in the United States, then here is a link to the lowest prices for consumer oriented SATA 3 6Gb/s ssd's at Newegg, Amazon USA, and LogicBuy:
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100008120%20600038519&IsNodeId=1&bop=And&Order=PRICE&PageSize=20
http://www.amazon.com/s/ref=sr_il_to_computers?rh=n%3A172282%2Cn%3A541966%2Cn%3A1292110011%2Cn%3A1292116011%2Ck%3Assd%2Cp_n_feature_keywords_four_browse-bin%3A6158693011%2Cp_n_feature_keywords_two_browse-bin%3A4929543011%2Cp_n_feature_three_browse-bin%3A6797516011&sort=price-asc-rank&keywords=ssd&ie=UTF8&qid=1399302426&lo=none...