More expensive initially, but they can be trained to return to your loft, allowing you to use the same birds repeatedly for flushing drills.
Local pigeon racing enthusiasts often sell "culls" or "surplus" birds that didn't meet racing standards but are excellent for training. buy pigeons for dog training
Search for "homing pigeons" or "feral pigeons" on Craigslist or dedicated hunting forums. More expensive initially, but they can be trained
Often cheaper (averaging $5–$20 per bird), but they are usually considered "one-use" birds as they will not return to your coop once released. More expensive initially
Some farm supply outlets can order live birds or connect you with local suppliers.