The Girls in the Garage compilations make a fun series showcasing the flames that the Brit Invasion spark lit on the USA's young women. It widened its search to unearth gems from Europe (you must hear The Plommons from Sweden Beatles tribute Last Train To Liverpool), Singapore (you do want a version of Yummy Yummy Yummy sung in Chinese) and Australia (you really want Little Pattie's He's My Blonde Headed, Stompie Wompie Surfer Boy).
Some of the albums' liner notes haven't aged that well ("a trip down Mammary Lane", anyone?) but the compilers' enthusiasm and research can't be questioned.
Two of the last compilations were reissued for Record Store Day. I can't really fault the records, but I don't see the market for them. They were offered at £20 each, which is about the maximum you'd pay second hand.
Yes, I know some nutjob paid £91 for Volume 9 Oriental Special, but if I based my financial planning on what someone did once on ebay I'd be in the poorhouse.
Anyway, I'm sure you'll stumble across some of the compilations in the used racks or even unsold stock sitting there in the new releases. There's some novelty, some beat group classics, some surprises (yes, that is Cher in 1964 singing Ringo, I Love You) and a lot of the sound you've heard being made in recent years by the underground distaff scene. This is where it started.