One of my favourite book by Olivia White Bright Lights and Glass Houses, is fantastic. It is not an aro book per se, it even had one romantic centric tale. It is written by an aromantic transwoman prior to her realising that she is both trans and aro, which made it extra interesting as I sort of figured out both by reading it.
Another one is Common Bonds: A Speculative Aromantic Anthology, edited by Claudie Arseneault, C. T. Callahan, Roanna Sylver. I haven't read it yet so can't comment on it.
A short story by Penny Stirling, Last Ocean Tide Lost in Sand. I didn't like it due to personal pet peeves of a subtype of specfic prose approach, but I still recommend it anyway in case if you do.