Market Value of Langevin AM16's?

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Hi all,

am looking at purchasing a racked set of Langevin AM16 pre's (4). Just wondering if anyone has an idea of their market value - I trust the seller but would like an unbiased opinion on their value as I'll have to ship them back to Aus and that will increase my outlay. Also wondering what Distressor's are going for second hand these days?

Regards.