u/EmbarrassedMeet1517

I want to make a triple or quad GPU build for my home lab for local ai, like I want to run TTS models, LLMS, image generation models and LORAs, please can someone help which GPUs should I use, I tried to find 3090ti but it is out of stock everywhere, there are some non-trustable sellers and all those are very over priced. Please help me with the GPU and motherboard, I want a minimum 24 GB vram for my setup