Here's my two cents
I've had such a mixed bag of experiences from all kinds of sources in 14 yrs.
MPC info I got 2nd hand about where they get their birds. My understanding is MPC takes the orders & private breeders provide the birds, exact details of which I know not. They are far from me so I never ordered from them. Most info seems positive. MPC must be a decent source to be in business for so many years.
I have ordered directly from out-of-state (VT, CO, KS, MO, CA) private breeders & some were flaky shipping wrong or sick birds while other private breeders were genuinely honest.
I've had feed stores that got their chicks from Privett Hatchery (New Mexico) ~ we lost 3 out of 4 ~ one chick death, a couple heatstroke adult deaths & one is still alive at over 7 years. Just never know how an individual bird or line of birds will survive.
At least reputable hatcheries guarantee alive chick delivery & if their policy is followed accurately by the customer they will refund any losses. However w/ most private breeders ~ once the bird is shipped they rarely refund $$$.
I'm not a fan of shipped chicks/birds but for a breed I really wanted I would go w/ a bigger reputable hatchery that refunds for losses. They refund the cost of the bird but I don't think they refund S&H fees.
Just note that day-old chicks are delicate & many die from different physical causes other than just shipping stress. If chicks survive shipping their ongoing longevity is good but not guaranteed. That goes for feed store chicks too that the store orders from a hatchery.
One thing I absolutely do ~ get the Mareck's vaccinated chicks. The extra $2+ for each chick is well worth it!
Go ahead w/ a hatchery that has your desired Buckeyes cuz there's no positive way to guarantee any chick health & order at least 3 minimum to allow for a chick loss. We got a single chick from a feed store & it lived only 23 days. We got 3 chicks of the same breed years later ~ lost a one-yr-old pullet later in a heatwave & a couple years later another sister to heatstroke but still have one left at 7 yrs old.
Glad we got the extra chicks.
Dana ~ our surviving Dominique.
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Bird health issues is the nature of chicken-keeping. Try not to over-worry about a breeder source if it's reputable ~ & go for your desired Buckeyes. Big hatcheries have large breeding flocks so inbreeding is usually nothing to worry about. It's when there's only a 1/2 dozen or less birds where inbreeding would be unfavorable. Post pics for us. We love pics! Good luck!