Maybe check sites like Craigslist. I know i have seen used steps/stairs on there relatively cheap.
I use an upholstered foot stool in front of an upholstered vanity bench, at one side of my bed. I trained ZoE to get on and off my bed using them, by giving her little chicken pieces during training. She picked up on it really quickly, and always uses them to get on and off my bed.
__________________ (ZoE  )(Chelsea ) |