I got my 2 gliders from The Pet Glider and recommend them fully! They take very good care of their gliders with good diet and fresh food. They also recommend the Animal Medical Center in houston
amcofthevillage.com/.
One of my boys was sick a month ago and I took him there. They were great, 100% saved my glider. They are knowledgeable on gliders and the whole staff is nice and caring.
If you are anywhere close I very much suggest emailing The Pet Glider and setting up a time to go and see them, they will let you handle some gliders and answer any questions you have.
(Also you need at least 2, they stop eating and self mutilate if left without at least 1 friend)