Second what rustybin says. Alternatively could be worth a look in Autotrader or Exchange & Mart for ads for companies that specialise in supplying bits for Japanese cars (as it's really a Honda engine of course). Reckon they should be cheaper than main dealer.
Wow Nick that was a bit steep ! Did you try Honda ( 2.7 legend, part no. 12251-PL2-003 looks like front and back are both the same ) pair for my 3.2 were £ 80 from main dealer.
Hiya Ken Didn't actually need the head gaskets themselves just everything else, couldn't be bothered to get each one individually at the dealer so went for a "Headset"