Where do you find reasonably priced copies of those Fritz Lieber works? My library only has stuff that fits into short story collections and omnibuses. I fondly remember reading a couple of these obtained from Half Price Books way back when and never getting to the end of series due to demise of local used book stores.

Old books... are a "find a copy in used book stores." They're fairly out of print now. The problem being "reasonably priced". If you're driving through the midwest, divert to Forsyth, IL and stop at the Old Book Barn.

I've also converted a lot of my book archive to ebooks. Sometimes I've been disappointed that the old books aren't ebook... but Fafhrd and the Gray Mouser are all on Kindle and for better or worse... https://www.amazon.com/dp/B09C23YVND?binding=kindle_edition

Otherwise, it's https://www.abebooks.com/author/b000apw3ua/fritz-leiber?ref_... because good used book stores with a appreciable science fiction collection are few and far between. I bought a lot of books at Book Buyers on Castro in Mountain View back in the day. There are some that are in the lower price bands.

Also, his works prior to 1978 are starting to fall out of copyright. https://www.gutenberg.org/ebooks/author/25421 - for example, The Green Millennium was published in 1954 and fell into the 28+28 and so that became public domain in 2010. The first six of the "Swords" series were published between 1970 and 1977... and should be entering public domain... this year?