Ahh - ripple!! Thanks Oztules, I wouldn't have known to look for a site called 'chemi-con'.
I've checked out Aliexpress, Mouser, RS-Online, DigiKey and Element14 and none seem to list the LMX series. Comparing specs (7000 hrs @ 105C) I found one at $55 each. No going to happen at that price!!
Any recommendations?
Still, as my Grandad always said - Buy cheap buy twice...