Why don't sell all google Phone fix Kits

iFixit (and most other 3rd party vendors) typically does not sell parts for new devices, except in the circumstances where they are an authorized vendor for them.

This phone, being released to the public less than 2 months ago, is too new for most reputable vendors to have parts for them available. This device will still be under every manufacturer warranty and, while those warranties do not always cover accident damage, sending it in to the warranty repair service is usually the only way to get it repaired when the device is so new as nobody else has access to the parts. This has the added benefit of preserving the original device warranty for future needs, and is the recommended course of action in this case.

The alternative is finding a part from a company that buys devices just to take them apart and sell the parts. Or to buy an entire device just to harvest the parts you need from it and sell the rest yourself. You can find such sellers on ebay and other such platforms.

Good luck.