Why and how are my kids excited to trudge through fields of mud to look at an endless mix of great finds and random crap?
This is how, I know their weakness... cars. And at every flea market, junk shop, yard sale or thrift shop there is the occassional toy car.
So I make them work. Earn stars for chores. A star is worth 10 cents. They can cash them in and spend their hard earned coin when they wish, but they have learned they can get a bag full of old cars from the flea market for the same price as one new one from Toys-R-us.
My older one has also learned charm goes along way and works an occassional freebie or two-for from the sweet old ladies. Mom gets a clean house and gets to look at junk with out background whining, and kids get a life lesson and some crappy cars. WIN-WIN.