I'm pretty new to this but I've already learned that the "end of the..." (month, quarter, fiscal year?) is a really great time to be a shopper! At the end of June I got two of those shops except I did have to do the purchase and return - $40 each! I also did a bunch of shops at a burger and ice cream treat place for $20 each - fast shop and report.
CORI is like a game for me!! I watch their shops just waiting to pounce on them when the price is right. Right now I'm holding my breath hoping some local shops don't get assigned as I want to do them on Tuesday!