Crucial are the latest case and point. Just today, they have introduced their V4(value) range of SSDs. They provide a read speed of up to 230MB/s and a write speed of 190MB/s. I should note that these are 2.5″ SSDs so they won’t fit inside an ultrabook, but will fit inside a laptop. You can get a 32GB variation for $50(£33), which should be enough to boot your operating system.
Of course, you will also be able to get a V4 SSD with 64GB of storage for $70(£45), a 128GB variation for $100(£64), or 256GB for $190(£122).