For the Pulp Fiction books, I’d check ebay or etsy, maybe amazon. I have one I paid $50 for on etsy(which was too much for me but I got excited and splurged) Depending on where you live, you may find some at a second hand book store, but I haven’t been lucky with that where I live. I just searched and found this… http://www.etsy.com/listing/80737931/kimberly-kemp-love-like-a-shadow-midwood?ref=sr_gallery_8&ga_search_query=lesbian+pulp+&ga_view_type=gallery&ga_ship_to=US&ga_min=0&ga_max=0&ga_search_type=vintageon etsy. There are also some reprints and collections I’ve seen around. I have one called Twilight Girls that has two stories in it, but /i haven’t read them yet.
Hope this helps!!