Was looking for a few S3700s and found this on ebay. Not sure if it is a great deal but this was the lowest I could find and the seller accepted an offer of $180 for 5pcs with free shipping.
58DVD DELL/Intel 400GB 6Gbps DC S3700 Series SATA 2.5" SSD SSDSC2BA400G3R | eBay
58DVD DELL/Intel 400GB 6Gbps DC S3700 Series SATA 2.5" SSD SSDSC2BA400G3R | eBay