If you want sales, hire a sales person. If you want to give them away
for free, hire a promoter.
It may be difficult as it seems more of a novelty than something that
increases sales for the bar or event. Why wouldn't these companies buy the
molds online and make it thenselves? Many bars already have circular
cubes... Unless it is very cheap, it will be difficult to make a ton of
money off of selling ice shaped glasses. It ends up being an added
expense. If in the next few months you dont have a ton of sales, you may
find it may not be the market you first thought. Now if you partnered with
a specific alcohol/had then sponsor your product exclusively, and all their
drinks get served in your glass, that may make more sense. Good luck.