We can consider the price in a few ways:
* As an objet d'art
* As a mount when it hatches
* As a magical item of "Summon Dragon"
As an art object, we can compare it to other art objects. The top tier of art prices at 7500 gp and I think dragon eggs fit there, or maybe below. 10,000 gp feels higher than I'd like in a world of 500 gp +1 swords. Call it 5000 gp for a super-fancy geode. If the super-fancy geode has some magical effect, like maximizing spells, treat it as a one-use magic item instead.
As a down-payment on a mount, we can look at the prices of similar vessels, charge half up-front for the egg and the rest ongoing as maintenance (say a recurring lifestyle expense of +5 gp). The young adult dragon is a warship, more or less; more maneuverable (... she can fly) but less cargo capacity. That'd put the egg at 12500 gp.
Finally, as a one-use magic item I'd have to call it very rare, giving a base sell price of 25,000 gp. As a magic item I'd be inclined to say the hatchling is docile from birth, bonding to whoever hatches it.
So, figure out which model you want and there's your price.
* As an objet d'art
* As a mount when it hatches
* As a magical item of "Summon Dragon"
As an art object, we can compare it to other art objects. The top tier of art prices at 7500 gp and I think dragon eggs fit there, or maybe below. 10,000 gp feels higher than I'd like in a world of 500 gp +1 swords. Call it 5000 gp for a super-fancy geode. If the super-fancy geode has some magical effect, like maximizing spells, treat it as a one-use magic item instead.
As a down-payment on a mount, we can look at the prices of similar vessels, charge half up-front for the egg and the rest ongoing as maintenance (say a recurring lifestyle expense of +5 gp). The young adult dragon is a warship, more or less; more maneuverable (... she can fly) but less cargo capacity. That'd put the egg at 12500 gp.
Finally, as a one-use magic item I'd have to call it very rare, giving a base sell price of 25,000 gp. As a magic item I'd be inclined to say the hatchling is docile from birth, bonding to whoever hatches it.
So, figure out which model you want and there's your price.