Next cheapest I can see for this is £324.99 at Amazon.
The 2.5-inch Crucial RealSSD C300 drive offers mobile and desktop users scorching-fast read speeds of up to 355MB/s. And because it has no moving parts, you will also enjoy a quieter, cooler, and more durable storage solution - and a better alternative to a traditional notebook hard drive.
Designed with high-speed synchronous MLC NAND, advanced controller technology, optimized NAND management, and the SATA 6Gb/s interface, these drives dramatically improve data transfers for bandwidth-demanding applications like audio and video.
The improvement in boot time and application load times push performance to new levels at the desktop too. You will experience improvement across a variety of common tasks such as viewing and editing photos, video, music and other media, gaming, communications, productivity and security.
Crucial RealSSD C300 series employ a standard hard drive interface and dimensions, so it is an easy storage upgrade for most notebooks.