I used Rent Frock Repeat for a black tie wedding last winter. It was a fantastic experience. You need to make an appointment, and it helps to go to their website and pre-select the dresses you want to try and they will have them all ready on a rack for you. They were very helpful and accommodating.
I rented a Nicole Miller gown for $150 plus a 15% discount for first time client. They shipped it to me 2 days before the event and I mailed it back the day after. (It was a non- wrinkly fabric or I would have picked it up).
All in all a great experience. I have no need for a long gown in my closet and felt very appropriately dressed without the huge expense.
The downside is that they do not alter. It was fine for me as I am 5'8" and almost every long gown I tried was perfect length, but if you are shorter I can see this being an issue.
Here is the dress I got - wore it with a big statement necklace and felt fantastic. https://rentfrockrepeat.com/pr.....etal-skirt It was very much my style, simple, not embellished, clean lines.
Highly recommend this service!