These are very highly regarded among professional artists. This set costs $229 at Eckersleys.
These are NOT your kid's colouring pencils. This is something for the serious or aspiring artist. They won't make you better at drawing or colouring, but if you're keen on these, this is a good price. The 132 pack was available on a deal here last year from Amazon for AUD$103, so this is even better.
Here's a Google Image search of the type of art that people are producing with these pencils: Prismacolor drawings