When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Are you going to change your wheels as well? People go low profile since they are up sizing the wheels and therefore need lower profile tires to match OEM wheel diameter. Since you want to go opposite, are you looking to commit to 16 inch wheels or below? If so, simply post to a Prius forum and offer to trade. I bet you will get TONS of offers.
IF not, the best thing you can do is go to 225/45/17 size tires. At the very least, you'll match your true speedometer reading (more on this later) while still getting a "little bit more meat" in the tires, both width and height.