Bought one this Sunday, had it Wednesday. 65 yuan for a 1-2 person, you’re free to it if you want to borrow it. There are also a ton of camping stores right next to Wuhou Temple.
I don’t think there are business that allows tent for renting purposes specially if its a camping tent. Maybe ask your friend if they have, but I guess there are the same stuff that is cheaper and effective to use, have you tried sun shade or a parasol like tent perhaps, like this sample from http://coastwideshadesails.com.au/shade-sails-products/umbrellas/. or sure you will like it, as I have also tried that.