There are three white morphs:
Blizzard (or blazing blizzard, which is an albino blizzard)

Line bred snow
(wich looks like a normal leo only with little to no yellow)
Mack super snow

And then there is the "visible het" form of the super snow, called the
mack snow

Blizzards can go for anything from $40 and higher
Line bred snows are priced based on the least amount of yellow, and top quality ones sell for hundreds of dollers.
Mack super snows sell for between $400-700 right now
And mack snows sell for $100-200.
All morphs are also priced higher depending on the genetics of the parnet geckos, the quality of the triats exibited, and the reputation of the breeder.
The pictures I used came from Alex Hue (Alexhuereptiles.com)
he is a very top notch breeder who offers some of the highest quality geckos ive found.
If your friend bought it at a pet shop it is most likely a blizzard. They can have eyes ranging from the normal grey to a bluish to a solid black. Sometimes they even have snake eyes, meaning the eye is half grey and half solid black.
Hope I helped,
-okapi-
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Leopard geckos:
19 (and 2 eggs)
African Fat Tails:
4