Where can I find these chocolate cups? Or at the very least a mold for cups like these? I really want to be able to order them because the bride wants a total of four cakes at the wedding (including this one, which is the grooms cake) AND 300 decorated gumball penguins done in the wedding colors as wedding favors. I don't think i will have time to make the cups even if I could find the mold, but if that's my only option, I will.

PLEASE, Is there anywhere you know of that I could order something like this from? All the premade chocolate cups I've found online are pretty small...

About the only thing I can suggest is to make them using a mini muffin pan. Fill each cavity w/choco, then dump it out. What remains in the cups allow to harden. Once they hard completely hardened they should slip right out of the pan.
That is sure a huge order! Good luck!