Based on the available information, it is difficult to provide a direct answer regarding the cost differences between tigecycline generics. However, I can provide some context that may help you understand the potential cost differences.

First, it is important to note that tigecycline is an antibiotic used to treat various infections caused by susceptible bacteria [1]. According to the Drug Patent Watch website, tigecycline does not have any generic equivalents on the market as of the date of the inquiry [2]. This lack of generic competition could contribute to higher costs for tigecycline, as there are no generic alternatives to drive down the price through competition.

However, the absence of generic tigecycline on the market may change in the future. The Food and Drug Administration (FDA) has approved several generic tigecycline products, but they have not yet been launched [3]. Once these generics become available, they may lead to cost reductions due to increased competition.

In summary, there are currently no generic tigecycline products on the market, which may result in higher costs for this medication. However, with the approval of several generic tigecyclines by the FDA, cost differences may emerge once these generics are launched.

Sources:
[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3591878/
[2] https://www.drugpatentwatch.com/p/tradename/TIGECYCLINE
[3] https://www.fda.gov/files/drugs/published/2015-Office-of-Generic-Drugs-%28OGD%29-Annual-Report.pdf