Superior Poultry in downtown Chinatown has guineas for $18 and pheasants for $13 (they're small and since it's a live poultry market they don't hang it so the flavor is a little undeveloped). It's my go to place for poultry - cheap and reasonably flavorful. They also have partridges, roosters (for authentic coq au vin), and wild duck in season. I think their address is 750 N. Broadway, LA
I've seen guinea fowl at Puritan Poultry in the Farmer's Market, though it's always the little baby ones, not the mature birds I want. I'm seriously disappointed at the general scarcity of capons here - I could always find them in Nashville, though they were frozen. Harmony Farms has neither of those in their website's list, though they might be available on order.
I make a very special dish during the holidays and i need a LOT of different meats and i go to Harmony Farms in La Crescenta.
They have the best prices(for LA) great selection and will accomodate almost any orders.
Yes it's a bit far, but well worth it.