I'm assuming by discreet you mean noise & having it lying around your bedroom isn't an issue. so w/ that in mind, here are a couple suggestions - I wrote reviews for them:
an affordable exceptional luxury vibrator, oh my...you just might have to have it yourself
Xxxxxxxxxxxxxxxtreme - YES!
G-Ki can hit my G-spot anytime, day or night, or inbetween
Lover wanted; only Lia i 10 need apply
texture, did I say girthy texture? well ok, girthy texture...
wow, I could keep going here.
a couple more great G-spotters that are quiet are Mona2, Vanity Vr 5.5, Delight, and Minna Ola. several of these vibes stimulate my clit as well. there are even more I could mention but I don't want to write a book here. I have found that there are quite a few quiet G-spotters. good luck in your search & have fun.