Really, all you need to do to find a fun kitchen bottle opener and save money on it is buy one of the models already listed above in this article. I have placed above kitchen bottle openers that have that "fun appeal" we are all looking for in a party starter, and each one only costs a few dollars.
Alternatively, you could go to Amazon's search results for fun kitchen bottle openers and sort by price, low to high. There, you can make your decision based on the lowest price you can find.
Another route to go would be to seek savings via a second-hand store -- the kind that resells housewares, like a consignment shop. Here, you may find a neat, older, manual kitchen bottle opener for a "can't miss" price. Rest assured though, finding what you like here is a hit-or-miss situation.
While you are out there shopping in the bricks-and-mortar paradise, be sure to stop by your neighborhood Goodwill Thrift Store. There, you can find a new, cheap bottle opener for the kitchen, I am certain. Also, I am certain it will not be a model one might classify as "fun", so just be aware of that fact.
Finally, and importantly, you should be able to find unique kitchen bottle openers on eBay -- the place to go to find unique little things, and often for a "crazy low" price.
Happy top popping!