[tclancy]

Being aware of this, I am waiting for a solution to what to do with the leftovers besides chuck them into a landfill. The problem, of course, is scale. No one is mailing 3 screws and an Allen wrench anywhere. Maybe once you hit 5 pounds of spare Lego . . .

[projektfu]

If you have an IKEA store they do have a place for spares, and you can return them there. Assuming you go back from time to time.

For stuff bought online, e.g. Amazon, not much you can do.