i think there was something in the uk, but i can't seem to remember, maybe i am mistaking.. search this forum, i think this question got answered before.
i mostly order by hekserij.nl. they have good quality stuff, for a decent price and you can buy very small amounts too. (aldehydes are incredibly powerful, and not nice when smelled pure. use them sparingly and only in dilution, like 1% or something). plus, the owner is a friendly and very helpful guy, he used to write here as janmeut and answer people's questions. a great alternative if you cannot find anything locally.
you can learn about the aldehydes here
and here too
what you are looking for are aldehydes c8, c9, c10, c11, c12. (aka octanal, nonanal, decanal, undecanal and dodecanal). the number is about the amount of carbon chains, the higher it is the longer the odor will last (because they are bigger molecules). they all smell different, but related.
btw, hekserij.nl sell much more than on the pricelist, just ask the owner.