Fully Built Out Razer Blade 17 2022

I'm considering getting a Razer Blade 17. In the specs:

the memory is 32GB when sold but upgradeable to 64GB

the SSD is 1TB, but upgradeable to 4TB if I replace the original 1TB with a 2TB

So the question, since Razer doesn't seem to sell them this way:

What is the best way to get one fully built out?

Are there third party vendors who do this?

If I do it myself, does the laptop come with the OS install media since I will be replacing the SSD with the OS on it?

Thanks in advance.

Nevermind, I got Best Buy to build it for me. Not impressed with Razer's configurability support.

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