Herbs & Spices
The links provided below are to web sites that have historical information about Herbs & Spices as well as some purveyors of spices, including some "hard to find" spices like Cubebs, Grains of Paradise and Long Pepper which were more common in the cuisine of the Middle Ages & Renaissance
Informational
Biodiversity Heritage Library
Online resource for historical herbals
Culinary gleanings from John Gerard's Herball or General Historie of Plantes
List of references to food preparation from John Gerard's Herball or General Historie of Plantes
Gernot Katzer’s Spice Pages
Detailed information on spices and detailed discussion their history, chemical constituents, and the etymology of their names
Medieval Gardening
Blog on Medieval Gardening
SpiceHistory.net
Supplemental website by the author of "The Taste of Conquest" to fill in the gaps with graphs, charts, recipes & links to other websites about spice history.
Retailers
Disclaimer: I do not specifically endorse any of the following, but they may have supplies you are interested in.
Mountain Rose Herbs
Wholesaler of Herbs & Spices
OliveNation LLC
A variety of ingriedients available including Herbs & Spices.
Perennial Pleasures
Has several Old World perennials including Skirret.
San Francisco Herb Company
Gourmet Spices, Herbs, Tea, Essential Oils and Potpourri at Wholesale Prices.
Starlight Herb & Spice Company
Chemical and Pesticide Free Herbs & Spices dried in small batches at low temperatures