I think they are discontinued, some retailers have limited stock of other colors, but as you say, the prices are very high.
Going from past experience (and I can't say for sure), but it's unlikely that discontinued frames ever become available back in stock (apart from one lucky instance when I found a single pair of Raen Ditmar's that weirdly just appeared on SmartBuyGlasses!!).
Keep checking in on those retailers though, as you might get lucky if the prices are slashed in an "old stock" clearance sale!!
As he's also been spotted in the Vogue brand, "In Vogue" VO2777-S W44/71 52□18 146, matte black with stock green lenses...
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...and VO2777-S (again, but W656/13) tortoise with custom orange/red lenses...
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(Apologies for some of the bad quality images there!!)
...it's just a thought, but you might also want to look at the Vogue VO4106S 55□17 125 (part of the brands Gigi Hadid range) as another option, as their rectangle shape has the same vibe of the Polaroid 6093's, Karen Walker Ali and the C&G 1308's. The gold looks more semi-matte though. The 55mm size sits between the 1308's 53mm and the 6093's 56mm.
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Buy Vogue Vo 4106sm Sunglasses online, see more Vo 4106sm Sunglasses collection with colors and sizes, Choose Your favourite Vogue Vo 4106sm Sunglasses and buy now.
www.otticanet.com
There are a few color options, but nothing with the 1308 GPL-04 light green lens color.
There is a better gold color with the 848/7H...
View attachment 1361266
Gigi Hadid For Vogue Sunglasses VO4106S 848 7H 55 is a pale gold frame with a orange mirror and silver gradient lens and is designed for women. It is a large style with a 55mm lens diameter. The bridge size for this model is 17mm and the side length is 135mm. This adult designer sunglasses model...
www.specsuperstore.co.uk
Obviously, at that price they should have a good quality feel, but a second hand bargain may be a better option and you'd obviously get rid of the "Vogue" lens logo if putting in light green customs. The 4106 do come up on ebay quite often.