How would you price this magic item?

[axiris]

An item that allows the user to become a dragon once a day.

Basically I figure it'd be a command word base, giving it CLxSLx1800.

Looking at the maximum dragon-ness here, we'll say Form of the Dragon III, an 8th level spell, which wizards cannot cast until 15th level.

Leaving us with 15x8x1800, or 216,000 gp.

We then make it a charges per day item (1), and divide that number by 5 for it following the formula, leaving us with a cost of 43,200 gp.

But there might be a similar item I'm not aware of to compare the pricing to. Does this seem right to you guys?

[Gauss]

Giant Hide Armor in APG has properties like that. If you then subtract out the +3 property you get the approximate price they use.

For Cloud Giant that would be 69165 - 9165 = 60,000gp.
For Frost Giant that would be 76665 - 9165 = 67,500gp.

Considering this is a special property being added to armor that mightve increased the cost some. Thus I would divide by 1.5. That puts the cost at either 40,000 or 45000gp respectively. This is similar to your pricing.

- Gauss