$100 is expensive for a giant day gecko. If you go to a retail location, then you'll pay a lot. Go with a breeder, either at an expo or through the internet, and you should be able to get a nice, CB day gecko for around $50 plus shipping.
I've sold P.standingi here and there for between $50-$75, depending on age. Adults will be expensive, so you'll save money by buying a young animal.
Phelsuma are probably the "best" display lizards to get for low-maintninence keeping. they are extremely easy to keep, provided you give them good supplementation, hydration and temps.
We've had our breeder female standingi for 13+ years, and she was aquired as a full grown WC adult. I've spoken to people that have had their animals for over 20 years. For that matter, I've spoken to people that have had WC klemmeri for over 15 years - and klemmeri are about the size of a hatchling giant day!
Read up on them, make sure you've got good calcium supplementation,a nd you'll have no problems.
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