DigiKey seems to be the best bet, at least for some models. It may take 1-3 months but they do seem to fill back orders consistently. Rpilocator tracks stock a

DigiKey seems to be the best bet, at least for some models. It may take 1-3 months but they do seem to fill back orders consistently. Rpilocator tracks stock and has found some sites stick things regularly once a week but if you don't buy within 10-20 minutes of the in stock alert, you'll miss it. Even Upton said he thinks the supply will be getting better to the point it'll be fully stocked again within one year.