Cute little one. Looks like a Phelsuma lineata lineata (lined day gecko) to me, or a subspecies of the lined day gecko.
I'm not sure how much they cost though, I have never seen one for sale in my travels. Judging from its size, I would say maybe $50 to $75. P.m. grandis and P. standingi run in the $90 range and they are much larger.
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Lisa
1.0.0 P.m. grandis (Linus)
4.3.0 P. standingi (Toby & Kona and their 5 babies)

