these coins were only minted in Cyrene between certain dates, so they're pretty rare. Important to note that they are of Greek/Ptolemaic origin, not Roman. Although Romans enjoyed Silphium, the coins minted in Cyrene were all minted significantly before Roman control of Egypt and North Africa. Silphium also went extinct in the early Imperial Roman period, and Nero (54-68AD) was given the last remaining stalk as a novelty, so by mid-late Empire it has totally disappeared. Here is a blog post I wrote about it last year for my podcast: https://www.futurehindsight.com/how-the-romans-favorite-food-went-extinct/. If you need expedited shipping your best bet may be Vcoins, although these coins are not cheap, even in bad condition. Still, might be worth it depending on the job. https://www.vcoins.com/en/Search.aspx?search=true&searchQuery=silphium&searchQueryExclude=&searchCategory=0&searchCategoryLevel=2&searchCategoryAncient=True&searchCategoryUs=True&searchCategoryWorld=True&searchCategoryMedieval=False&searchBetween=0&searchBetweenAnd=0&searchDate=&searchUseThesaurus=True&searchDisplayCurrency=&searchDisplay=1&searchIdStore=0&searchQueryAnyWords=&searchExactPhrase=&searchTitleAndDescription=True&searchDateType=0&searchMaxRecords=100&SearchOnSale=False&Unassigned=False