The SRD does say something about it:
Quote:
Market Price: This gold piece value, given following the word “Price,” represents the price someone should expect to pay to buy the item. The market price for an item that can be constructed with an item creation feat is usually equal to the base price plus the price for any components (material or XP).
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...which, if I'm reading the context correctly, covers all forms of magic items, including potions.
Also, good news! Construction was cancelled today due to wheather, so I should be there today.