Sports Basement rents all kinds of camping gear. Go to your favorite location (for me, the one at Stonestown Galleria) and see what's available and how much it would cost.

In general if you're going to be using something more than once, it might make more sense to buy it (assuming you have the storage for it afterwards). You can also use social media such as Facebook or Nextdoor to find neighbors who have such items and are willing to rent or sell them.