I have really enjoyed the expensive thing thread. My eyes have nearly popped out at some of the stuff!
So for my expensive waste I would say it was an old Landrover discovery which cost more in repairs than our mortgage at the time and for my best cheapest I would have to plump for Stylecraft DK yarn and embroidery threads which give many hours of pleasure for very little cost.
And my most expensive...Mini Cabriolet, dog and diamonds.