A lot of them (not all of them) are posted on the item descriptions now. For example, on the Sorcerer from Etsy, it says:
This is the shortest saber we have ever made, from the pommel to the blade holder it is only 8.75in long.
And on the site, from the Disciple (once you select a tier, and the customization screen comes up), it says:
The focal point of the hilt is an ergonomic leather wrapped grip. The handle is 10.8in long, with an diameter of 1.35in. It is ideally suited for a staff configuration and spins effortlessly.