I do think folks may also be overlooking that this seems to be one of the rare instances in which a freebie and a rebate overlap. It appears that the $19.99 buy requirement applies before the rebate so you can still buy one railcar and qualify.
Definitely prime time to buy if you live near a Menards (to use the rebate) and have any use at all for a box truck.
I really don't need more rolling stock for what is a seasonal layout, but I'm eyeing that CNW boxcar