I have a like-new Samsung PB22 256 GB SSD that fits inside laptops and desktops, or can be used as an external drive with the included enclosure/cord.
This is an inexpensive way to speed up your system for all uses (gaming, video processing, every day work) since the hard drive is usually the performance bottleneck. SSDs can perform up to 10x faster than traditional hard drives, and the 256 GB capacity means you can hold a ton of stuff.