This might be a bit late regarding this matter, i have a digilux 2 since it first came out so more than a year now i think. Filter is a BIG annoying problem.
I went to a panasonic show room and they say if you want to get a filter, they don't have it and you can only get the Leica one.
At the end of the day, i just went hunting for the cheapest one i can find. At where i am from, i found ones for USD $115.00