Amazon has got these 50-count Hanna K. Signature Collection Heavyweight Plastic D'Vine 1 oz. Shot Cups for $1.39. No quantity limits. 4.3 out of 5 stars over 3 customer reviews.
This is an Amazon Add-On item, which means that it ships for free with a $25 minimum order if you are an Amazon Prime member (and its price of $1.39 counts towards that $25), or it ships for free with a $49 minimum order if you're not a Prime member. You can buy multiples of this item to help get you to your $25 or $49 minimum for free shipping. (Other Amazon Add-On item deals can be found here.)