need some cheap unopened ideas to fill up a sub

I've got about 70 ready to go for the $6 special but only 35 or so ready for the $4.50 special which requires at least 50. I'm looking to buy something relatively cheap to bust so I can fill that sub. I've had a lot of success busting vending recently so I think that's the way I might go. Baseball Card exchange has '77 Baseball, '80 Baseball, '78 Football, and '81 Football. Does anyone have any other thoughts or ideas? Anyone have any other unopened they might want to part with or know someone that does?
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1984-86 Topps football are still hot too. I would avoid baseball if you are looking for a quick flip. It's football, basketball and that ice skating sport season.