I discovered this past year that Cort Furniture Rental has clearance centers. Our local one is great--the staff are super helpful, and you can buy both used (previously rented) and new furniture, at good prices.
The fantastic thing I discovered is that you can get discounted packages on furniture and art for a whole home--or at least, everything for a one bedroom, to start. They have 2 tiers: $1499 and $1999, and have 21+ pieces in each set, covering the LR, DR, and BR. Within each set, there's a fair amount of options for selecting different styles and materials. It's a great way to get the basics for your furnished rental, quickly and affordably, on a single truck.
Of course, you still have to get all the little things for the bathroom and kitchen, but getting the major stuff out of the way in a single visit, at a package price, is great.
Here's a link to my local store's package: https://portland.cortclearancefurniture.com/used-furniture/special/special-offers/21-piece-apartment-to-go-premium-package-1999-99/52ed4403-d858-4d64-a2a4-36270ac327bf