Thank you everyone. I will have a look at the links (the other threads) for additional information.
I do have some good software, Starry Night Pro. Is it the same as Stellarium? Wow, I see that Stellarium is free. Well, I got the other one as a gift not too long ago...

Are there any additional features Stellarium has?
About the moon filters, the Seben one sold separately on eBay is blue, but I also like the grey one from the moon photos I have seen (actually I like the grey one more than the blue one), and the grey one is in the package of 4 colours. For some reason either they don't sell it separately or it is out of stock (as a separate item).
I have also found this moon filter, which apparently reduces light pollution in addition to being a moon filter. Not 100% sure if it can be used with all brands.
http://www.ebay.com.au/itm/Ostara-1-...item2329045d66
And this nebular filter:
http://www.ebay.com.au/itm/Meade-Tel...item53fa76265b
I will have a look at the other links now to see if there are better options.
I need the moon one urgently, but unfortunately the reason I prefer to buy after Christmas is that there is too much chaos right now, particularly if you buy from overseas...