One of the neat things about solid-state drives is that, because they use a handful of flash chips instead of rotating platters, they can be squeezed into new form factors without too many sacrifices—if any. That's just what Crucial has done, releasing 1.8-inch versions of its famous (and TR Editor's Choice award-winning) RealSSD C300 drives for "ultra-thin laptops, netbooks, and tablet PCs."
The 1.8" C300 SSDs are available in the exact same 64GB, 128GB, and 256GB capacities as the 2.5" offerings, and they have the same rated transfer speeds, as well: 355MB/s for reads and 215MB/s for writes. 6Gbps Serial ATA support is still on the menu, as is three-year warranty coverage. Crucial is also charging the same for 1.8" and 2.5" RealSSD C300 drives on its own online store. The 64GB model will set you back $149.99, while the 128GB drive costs $299.99, and the 256GB one is $599.99.
You can apparently save a few bucks by heading to Newegg, which has both 1.8" and 2.5" C300 drives listed below the official Crucial prices. There, however, the 1.8" offerings cost about $10-20 more than their 2.5" brethren.