A.M.
There were a few places I looked when I was needing a glider and it depends on how patient you are to wait for one. You can try Freecycle.org to see if anyone will give you one they don't need, Craigslist.org to make an offer for one or ask for one free, and then there's good ol' Babies R' Us which is where I got mine because they had the biggest selection. Also in there is Kid to Kid or one of the consignment stores that sell them but they are hard to come by because they go so quickly. They have a wish list you sign up for and they will call you when it comes in but that is something you have to resign up for every month till you get to the top or they get to you. Good Luck and congrats!