Lego brick pinata with candy - $10 (make myself)
Primary-colored balloons - $4
Lego guy - round cake with yellow icing and face, cardboard stand with Lego guy body - $10 MARY IS MAKING, WOOHOO!
Candles - $2
Party favors (and activity) - 17 Lego cars $76 (incl shipping), Lego candy (maybe) - $15
Primary-colored tablecloth, napkins, small plates - $5
Activity: Build Lego cars and race them - $0
Punch - $2
Total Cost: $120
To Do: Order Lego cars, Buy Lego candy, Make and stuff pinata, Make racetrack, Make and mail invitations, Get addresses for kids, Make Lego guy head, Find stick, Get balloons, tablecloths, plates, napkins