From the time I've signed up on the site, I know B&H has some professional editing equipment like Blackmagic Design capture cards that I wish could be added to my part list... I've NEVER had this work.
For instance, the Decklink Duo 2 is here: https://www.bhphotovideo.com/c/product/1247779-REG/blackmagic_design_bdlkduo2_decklink_duo_2.html
I can't add it from the URL. I've never been able to add any capture cards to my part list from B&H even though they have the most up to date pricing on that equipment.
You can search for the part on amazon.. and after you add the part, you can put a custom price. Its a temporary solution so you can add the part to your list.
PCPartPicker part list / Price breakdown by merchant
I have been doing that. I'm just bringing this to attention cause this hasn't been fixed for quite a while.
We have some limitations with our current implementation on how we're able to look parts up on some retailers. B&H unfortunately we're not able to look up right now. However, I agree with the products they list it would be advantageous to get price tracking working for custom parts for them. I think there might be a way to get that working... I'll look into it.