Not much of a Stamp Ralley but head to H&G Mall. Click the white sign to get a stamp HUD. Wear it and click the stamp machines nearby for 75 points. You get 75 points a day (so if you want more than a couple prizes stop by tomorrow!)
There are many prizes to choose from and they are about 20 points each. Make sure to check out the shops cause most of them have great lucky boards. Goodluck!