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This filter looks interesting, but its going to cost heaps. There's also the triad filter. They might have an advantage of narrow bands around OIII. But otherwise their end use will be the same as the Duo filters when you split the R and B/G channels on an OSC camera
I'm using the STC duo. I like it and was about $450-500?
There's also the more recent optolong L-enhance which I understand might be cheaper? And it looks like the Duo. A few people on cloudynights have just got it, so might be worth keeping an eye on the threads there.
I find the Duo works really well on objects that easily split Halpha and OIII. If its doesn't the Halpha just swamps the OIII - you'll see that on a lot of shots over ob cloudynights. I've found for these objects you have to split the channels and follow a narrowband workflow - and I'm still trying to figure this out
Edit: just noticed Tomy's response. Ouch $1800!!
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