Michael Phelps' historic run at the 2008 Beijing Olympics is one of the most memorable athletic performances ever -- and now a one-of-a-kind set of 8 oil paintings, done by a famed artist, and signed by the immortal swimmer, is up for sale ... but it's gonna cost ya!
TMZ Sports has learned the "Golden Eight" collection, created by renowned artist Brian Fox -- known for his ability to capture celebs and athletes -- is being shopped for $2 MILLION!!!
Each of the eight exquisite pieces, commissioned by owner Todd Patkin in '08, was inspired by a moment from the Games .