Hi Mark
I think JHA have stopped trading. They closed shop around 18 months ago, so you'll be looking at second hand cans nower days I think.
I use JHA on both my NSR and RS and have to say they are the best cans I've used, but as you say they are expensive. If it's for the road I'd use TYGA cans, they are excellent value and do everything the JHA do (except they are a bit heavier).
Cheers
Dan