Haven't seen that but its not really a cost effective option for me.
Good idea though.
could you not save them up over time, and then trade them in? i doubt people would want to pay the postage for anything less than 50 tubs, as it would work out really expensive for postage.
Can't really save them up, I have hardly any space as it is, I just want rid of them. But throwing them all out seems like such a waste.
Unless I had enough boxes to get 2/3 boxes of crickets sent out at one time with free postage it isn't much use to me unfortunately.
And it would take me FOREVER to save up that many boxes