Depends on how many the customer buys, how often etc.
The ones I can get the easiest at the moment are:
-EVGA GeForce RTX 3080 FTW3 Ultra / 10GB GDDR6X (around 1800€)
-EVGA GeForce RTX3070 XC3 Ultra Gaming 8GB (around 1150-1200€)

But also Nvidia Founders edition at this moment wouldn't be a problem. 3080 FE around 1900-2000€, 3090 around 2600€; the new 3080ti around 2100€ (I have 10 of those right now).

Hey so this is the first time for me posting here. I read about the rules, and I hope it's fine for me posting.

I am based in Germany and I am selling brandnew and sealed GPU's from Nvidia, AMD and all the 3rd party manufacturers. If you are interested in building a mining rig or extend yours hit me up. I can get as many GPU's as you wish. Don't worry, I have a real business and we can do all the precautions so that you can be sure not to be scammed.

I hope I posted in the right topic and this won't be deleted

Hit me up if you're interested, cheers