Navigating Indieworld Discussing All Things Indie discussion

My wife and I are in the process of moving to a smaller home, so we're unloading everything we don't need. Unfortunately, I have rather a stack of paperback copies of original edition Ice on the Bay (like . . . probably close to 200) and a smaller number of The Fibonacci Murders (19 at last count). Because I released new editions with fancier covers, I'm not actively selling these anymore. If possible, I'd like to find some way to offer them as freebies (for just the shipping cost). Does anyone know of any good places to announce/promote something like that? Thanks!