
I used to buy these Gen-2 carburetor insulators for about $40 per set of four. Those days are behind us, and they now list for $90 from Honda, or about $75 via the internet. These are OEM parts — I've never found aftermarket Gen-2 replacements.
But here's an eBay seller offering sets of four for only $60.42 (w/coupon code) including shipping.
I'm amazed that Honda still has these available (not true for the Gen-3) so we should grab them while we can.