SHOREWOOD, WI (CNN/WISN) -- A Wisconsin woman, and loyal Goodwill shopper, spent $12 on a piece of second-hand art, worth $9,000!

Karen Mallet flashes her Goodwill loyalty card and brags about her deal on Wolfgang Puck knives. But the cutlery seems like a small bargain she scooped up at this Goodwill next to this. She says, "And I saw it and I thought wow that's interesting."

The print caught Karen's eye, but what she spotted in the lower corner, caused her to grab it instantly. She says, "I looked down and I saw the signature and I thought Calder? Alexander Calder maybe? And I was very surprised and I thought surely not. I used my Goodwill loyalty card and I ended up paying $12.34. I found an art appraiser in Chicago, loaded it in the car this summer and took it down."

Turns out, she has a good eye. Karen says, "It is a signed lithograph, it's number 55 of 75."

Titled "Red Nose", it appraised at a shocking $9,000. Surprisingly, Karen's not rushing to cash in her treasure of a find. She says, "At first I think, well what should I do, should I sell it, should I keep it and I didn't particularly like it at first but then it grew on me and now I really like it."

Goodwill says it tries to spot valuables to auction them online for more money, but things can slip through the cracks. Obviously, that was the case here.