Those might be rebadged GSO filters. Could be worth a call to the Australian GSO retailers (Bintel and Andrews, to name two) and see if they can supply those filter sets and at what price. Polarising and OIII would be useful, perhaps the UHC - depending on how they perform, of course. I think you might be best buying better quality, one at a time, as you become sure that you will use them. If one or two in this set get little use, the price averaged over the ones you do use might not be that much of a bargain.
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