S.O.
We did not spend money on a toddler bed for any of the boys. Lots of money, lots of hype about them, very short lifespan.
When the boys were climbing out of the crib, we moved them to a twin mattress on the floor. Later we bought the box spring, and put that underneath. Both still on the floor. When the kids were about 4 or 5, we bought the frame and put the set on a frame.
Had the youngest really like the set on the floor. He was 11 before he wanted the frame underneath. Fine by us.