hey simon, i too have a paint mixer i got from my lhs, but i think mine was from micro mark...but its prob the same as maddafingas...and i too dont know how i lived without it....
u might wanna check out woolies and have a look in their utensil section, coz i saw a latte mixer in there and it was almost identical to the one from the lhs, only a 3rd of the price. the only difference is the tip. the mixing tip on mine is a small disc (bout 5c size) with small indents round the outside. some one here might be able to give u a pic as refrence, coz my camera is out of action.