Prices of reagents in Ultima VII: The Black Gate

Reagent         Rudyom  Nystul  Nicodemus  Wis-sur  Mariah    Sarpling
                Cove    Britain Yew        Vesper   Moonglow  Terfin
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Black pearl      5*     10                  **       8

Blood moss       3       6       3          **                 2*

Garlic                           2                   1*        1*

Ginseng          2       4                           2         1*

Mandrake root    5*     10       5*         **       7

Nightshade                       5*                  6

Spider's silk                    3*         **

Sulfurous Ash    4       8                  **                 3*
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Notes:    * = cheapest
         ** = Wis-sur sells reagents at absurd prices, but you can bargain