I find my props for my home studio at garage sales and thrift stores. I have a wicker chair that I use quite a bit for my seniors at a thrift store near my house for $10.00 The best investment to date. I also just purchased a baby doll bed for $5.00 at Goodwill and used it for the 1st time yesterday to put a preemie in it. Turned out precious. Another place to look is the $1.00 section at Target for Holiday props. (ex: Easter,4th of July) Hope that helps
Yard sales, hand me downs, flea markets...are all great places to look for cheap props.
What props to get depends on what you shoot. Props for newborns are not the same as props for models which are not always the same as props for rock bands.