Atm, the teleport function of the Amulet of Glory does not work, so charge number is currently not a factor. Therefore, a charged Amulet of Glory may be around 500k.
However, I do believe N0va is still making Glory Amulets for free, if you bring him a dragon stone. So then all you would need is to find somebody with a high enough magic level to charge the Amulet of Glory, and the cost of doing so may vary from person to person.