Cost comparison with Penstock's Land Agency.

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At Penstock's: 1250 Brilliant Souls, or 625 Echoes.

Here:

100 Muscaria Brandy, or 250 Echoes;

plus 500 Brilliant Souls, or 250 Echoes;

plus one Brass Ring, or 12.5 Echoes;

minus(because you are gaining, rather than losing, these items) one Uncanny Incunabulum(12.5E) and 5 Aeolian Screams(12.5E) for a grand total of 487.5 Echoes, so 137.5E cheaper than Penstock's.