Re Astromart
I agree with Darren, give Astromart a go. I picked up a 2" OIII for $125.00 USD. WhichI got within a week or so of paying. That is way less than a 1.25" would cost.
Here is an advert off Astromart today, most sold unfortunately but it gives you an idea on price.
ORION Sky Glow - good broadband LPR for price 1.25" $40 (( SOLD 2" $55))
ORION UHC - great filter, just as good as Lumicon. 1.25" $55](( SOLD 2" $75 ))
Lumicon OIII - also great filter. (( SOLD 1.25" $70)) (( SOLD 2" $150 ))
Lumicon H-beta - for faint nebs. (( SOLD 1.25" $75 ))
ORION Minus violet - Takes out purple edges for refractors (( SOLD 1.25" $35 ))
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