Back when I used to "collect" runs and went to cons to hunt through bins and such, Sensational She-Hulk #36 was the hardest find. I eventually did find it, but I'd been trying to complete the Byrne run for about 15 years. Sadder too when you see most issues in dollar/quarter bins, just never that one for me for some reason (ended up paying $6.00 for it, and felt it a bargain after the wait).
she-hulk 36.jpg