2,999. Bechoros as Cheirem

Hilchos Arachin Vacharamin 6:13

If a Yisroel (an Israelite) proscribes a firstborn animal to Heaven, it is effectively proscribed. This is true regardless of whether the animal was blemished or unblemished. It goes without saying that this is also the case if a kohein proscribes the animal to Heaven after it has come into his possession.

Hilchos Arachin Vacharamin 6:14

The animal in the previous halacha is redeemed as follows: We appraise how much someone would pay for the right to this firstborn animal so that he could give it the kohein of his choice, perhaps a friend or a relative. Whoever pays this amount gets to take the animal and give it to the kohein of his choice. The proceeds from this sale go towards Temple upkeep.