When you are experimenting a lot, it can certainly come in handy to have a few different camera's lying around. You could of course buy those fresh from the store. Better still, there are a lot of places on the internet that sell exactly what you need second hand for a lot less.
For instance there is Print Space Marketplace (would they know it rhymes or just don't care?).
A dedicated photography market to buy and sell equipment. You can check in using for example your Facebook account. Easypeasy!
Where would you be without your favorite photography gear? New, old, analog, digital, check it out!