I don't think realistically anybody would buy a tub of Legos for fourty bucks. Twenty sounds about right.
HOLY stuff MANWHY YOU SELL FOR ONLY 20 DOLLARS
Some of those sets are $20+ anyways lolAdding them all up, that's a good bit more than $35.
He're the exact thing you should tell your dad:"Dad, I looked a bit on the net, those sets were worth MUCH more then 35$..."