please reconsider your decision to get a solo glider - while occasionally a glider can do ok alone, that's the exception to the rule. they're colony creatures by nature and strongly crave the companionship of at least one other glider; keeping a single glider can cause them to become so depressed that they stop eating and possibly even die. while gliders can come to love and bond strongly with a human, no amount of time you spend with a glider can replace the need for a companion of their own species - someone who speaks their language, who curls up in a pouch to sleep with them, who jumps around the cage playing with them. it's like how no matter how much you love your pets, you still need human interaction as well.
contrary to what one might think, getting two gliders won't cause them to bond to you any less (in fact, I theorize it can actually help because having a friend makes them happier in general - I saw a definite change in my breeding pair when Tabby's quarantine ended and I was able to move them in together so that they were no longer alone). it's so much healthier and better for gliders to get a pair instead of just one.
if cost is the reason for only getting one, then you may want to reconsider gliders as a pet. I'm not trying to be harsh by any means, but the simple truth of the matter is that gliders are expensive. you need a very large cage, cage sets, a wide variety of foraging and enrichment toys, start-up supplies for whichever diet you choose to feed, a glider-approved wheel (ie stealth, fast-track or raptor; custom cruiser is definitely safe and wonderful for gliders, but it's not a good choice as their only wheel - it's best used in addition to a regular wheel due to the unique way it works), a decent tent (preferably pop-up so it's minimal hassle and you really want one with mesh sides) unless you're going to glider-proof a room or bathroom, mealies (if they're old enough - gliders don't tend to start liking them until 4-5 months old), bonding pouches, food dishes and possibly a "kitchen", a water bottle, yogies, a well-stocked emergency kit, a travel cage and/or small "hospital" cage just in case you ever have to separate them temporarily...
you can save money by building a PVC cage rather than buying one, by making the cage sets/pouches *if* you have a sewing machine and know how to do glider-safe stitches and hidden seams (though I still suggest purchasing the "start up" stuff so that you can actually see exactly how glider-safe stuff is done), by making your own toys, etc. but you've still got to pay for materials for everything.
all-in-all, you're looking at a minimum of $700-800 in start-up costs for a pair of gliders (including the $300 or so for a pair of standard grays) even with making a lot of stuff yourself, plus you need to set aside as an emergency vet fund (preferably of $300+). most of those costs are the same whether you get one glider or two.
anyway,
here's
a database of breeders that might be able to help you find a good one within a reasonable driving distance.