I don't know if you have a Lego Store near you, but you can walk into a Lego store and buy generic Lego bricks in every color. They also have a great website that lets you order 1 of any specialized brick they make or the generic bricks in bulk for pennies each.

Not sure what the problem with that is. And as others have said, after a week all those legos just go into one pot anyways and mix together to make anything.