I have a Hutech IDAS LPS-P2 48mm light pollution filter suitable for dslr cameras. Arguably the best light pollution filter you can get. More info
here. I used this extensively in suburban Adelaide. Filter is in good condition with some minor dust but always stored in plastic case when not in use.
New ones sell for US$189 + postage.
Will sell for $150 including postage anywhere in Australia. Local pickup welcome.