Not mentioned within the photo posted by OP is the fact that the protesters were disrupting a National Vietnam War Veterans Day commemoration, an event for honoring the "bravery" and "sacrifice" of the US soldiers who are responsible for causing an overwhelming amount of pain, suffering and death in Vietnam. It's honestly just so fucking crazy that right before the departure of a US naval ship to go support a genocide, they're celebrating the so called heroes of one of the most disgusting wars perpetrated by the United States in the 20th century.

https://sfbayview.com/2024/03/palestinian-organizers-protest-navy-vessel-said-to-be-headed-to-israel/ , this is the most recent news I can find about the protest, though it's not said whether or not the ship was able to leave

I have had a good experience buying second hand online from https://www.betterworldbooks.com/ and https://www.thriftbooks.com/, they're both good when it comes to looking for used leftist theory books. Other than that I typically just check out my local bookstores or libraries to see if they have any used copies of something that I'm looking for, it can be really hit or miss though.