they are hard to find in the uk, expensive to buy and can be very expensive to keep as they are predatory and eat live fish.
unless you have plenty of fish to feed them you will be spending a small fortune at your lfs.
don't be fooled by story's of people saying they can be feed on normal fish foods . and if you can get them to take frozen food they will only eat it when they are starved and it is a well known fact that a starved female will quite often eat the males.
this is a old post
i only have 1 pair of Belonesox