I note no one has mentioned "Entropy Effect". Not sure of publication dates and all that, but if it qualifies as "Bantam".
"The Entropy Effect" was a wonderful novel to kick off Pocket's original Trek fiction line, which continues to this day. It created a lot of fan controversy when promoted with an extract in "Starlog" magazine because fans were outraged that someone would dare to kill off Kirk, even when reassured that the story occurred before the events of "The Motion Picture".
To do a quick check, type the title of a book plus the descriptor "Memory Beta" and you'll get a page dedicated to each novel.