As Les says, RRP is recommended retail price.

The piston price from HRC was infact only $112.10, not the $120.00 I quoted.

Want another example, crank case set,Honda RRP $8272.20, Red line price $10732.20.

Honda have these in stock!

http://www.lingshondaparts.com/honda_part_number_search_A10.php?partdes=11000-NX6-307

$2000+ mark up on Honda RRP.

I'm not saying it isn't great you can get part from him but he has increased the prices (by a huge margin) in most cases over what Honda will sell them direct for.
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If I have to take the carbs off once more...