there are always periods of regret...most everything I have sold , at one point or another I have managed to replace...so while there was regret in between, there really isn't any book I have truly regretted to the point I have not been able to reacquire....
the only book that I would regret not having or not being able to replace would be my first comic...silver surfer #1...that, for a period of time, I thought was lost, but we found it about 10 years ago...only comic I have from my childhood and ultimately, probably the only comic I would , today, regret not having