Newegg offers the Team Group L5 Lite 3D 480GB Serial ATA 6Gb/s 3D NAND 2.5" Internal SSD for $49.99 with free shipping. That's $5 under last month's mention and the lowest price we've seen. (It's the best deal now by $10.) It features read speeds up to 470 MB/s, write speeds up to 420 MB/s, and a 1,000,000-hour MTBF. Deal ends December 20.
Uncle Sam could take a hefty chunk of your retirement income if you botch this.