Where to purchase replacements ear tips for AirPods Pro 1?

Apple no longer sells tips for First Gen AirPods Pro.

You can find alternatives in places like Amazon.

click here ➜ 4 Pairs Replacement Ear Tips for AirPods Pro 1st Generation,Noise Reduction - Amazon.com

FiferC wrote:

I’m in the US. I could find generic tips on Amazon, but was hoping for a source of genuine Apple replacements.

None on Apple's web site. The 1st generation models are now "vintage", so Apple's support is very limited to non-existant Obtaining service for your Apple product after an expired warranty - Apple Support Your only resource now will be third party unless somebody has old stock.

I saw some for sale by Target where you may be able to at least have a look at them before buying.

FiferC wrote:

I’m in the US. I could find generic tips on Amazon, but was hoping for a source of genuine Apple replacements.

Honestly, a lot of the third-party tips are better. You get more choice of size and materials.

I did a Google search and found many vendors on the first page of results. Since we have no idea where in the world you are located then it's hard to make any recommendations.

Unfortunately since Apple no longer makes them, finding brand new original ones is going to be close to impossible.