I am looking for blue PCBs for an art project. Does anyone know where I can purchase some? I'm having a lot of trouble sourcing them. Thanks

Interesting. Is there a deadline for project completion? Do you mind sharing more info about it and maybe a general location? Depending where you are someone here might be able to help you out.

If you have a scrap yard anywhere near you try and go by and tell them what you're doing and what you need. Be polite and maybe bring some empty soda cans in to give them some business. Or if there's any electronics manufacturing companies near you, see if they have any product that failed. Keep in mind they may prefer not to share if there's any proprietary stuff.

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My grades are my own opinion and not an official grade from Boardsort

I assume you are referring to Printed Circuit boards rather than Poly Chlorinated Bisphenols. Just curious if you want only unpopulated boards, or anything that is blue. Also, how many?

Fastest is ebay.

Least expensive is finding a board fab and buying their failures by pallet.

High risk is buying Asian low end tablets in bulk. The vast majority of sub-$30 tablets and “children’s” tablets are nearly identical rebranded. With blue boards. But you roll the dice on getting black and red boards as well.

Or look under a PCB supply company for breadboard.

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I have a couple if you are interested.