OGC is $40 per firearm. $25 for active military or law enforcement.
I'm neither active duty nor retired, but they gave me the discount for showing my DD214 discharge form. They may have changed that policy and only give the discount to active military now as stated on their website. Worth asking the question.
You can use their website to "purchase" an FFL transfer, which alerts them of your transfer and emails you a copy of their FFL certificate for forwarding to the seller if needed.
When you use the online check-out, the transfer cost is $0. You'll actually pay when you pick up the firearm.
Painless process, and can be started online.

$40 barely covers their cost of doing a "no surprises" transfer. If they have to resolve any issues, they're probably losing money. $25 is probably below their labor and record-keeping cost. I've completed several transfers with them.