SanDisk offers its SanDisk 500GB Extreme Portable SSD for $105.99 with free shipping. (Best Buy, Adorama, and B&H Photo Video match this price.) That's tied with our mention from two weeks ago and the best deal we could find by $18, outside of the mention below. It features transfer speeds of up to 550MB/s.
A close price: Office Depot charges $109.99 with free shipping.
With these companies, it might be easier than you think to negotiate your monthly bill down.