Vapouriz do some nice blueberry and blue raspberry liquid, in either high PG or 50/50 (this is a newer range and i tend to prefer this personally), it's 10 smeckles for 3 bottles, but their raspberry flavours are nice for me (for juices on the higher PG end anyway). The regular raspberry is nice to, i'm just partial to the blue kind.
Just don't buy Blu eliquid, the raspberry liquid i thought "i'd try" from them(because it sells in every day convenience stores) was one of the most disgusting juices i've ever tasted(and you'd be hard pressed to find a bad version of such a simple flavour).