Under $30 a month for a 24 hour fitness membership via Costco with zero initial cost ;)
"Nice" gyms like Equinox are of course significantly more. It's important to segment the gym market into different tiers and niches, and figure out what the market size is for each. Same as for direct equipment sales like this.
To your point, though, I suspect the people who would pony up for a Peloton are the same people who would splurge for a $100/month gym membership instead of a 24 hour, Planet Fitness, or local hole in the wall gym.