In "9h Nine Hours" capsule hotel (Japan), according to their website a standard plan of 2 nights stay will cost you 5900 Yen (about $54 USD), I am not very sure though since the plan is saying "should be maximum of two nights" (I provided a screenshot below for you to see what I mean). Yes, I learned in my research that prices vary by country. Also, I learned that capsule hotel does not always mean less expensive.
Here's a screenshot of their plans..
