I've been searching the internet for ages for several Sachiko Kobayashi records from the 1960s, but most of the time they're only available on Japanese websites like ヤフオク! (Yahoo Japan Auctions), and I've been able to find one on Discogs, but it goes above my monthly limit. Here are the links to the 1960s Sachiko Kobayashi 45s on Discogs, as I have contributed the information, except on the last 3.
https://www.discogs.com/小林幸子-ウソツキ鴎チビッコ三度笠/release/13389617
https://www.discogs.com/小林幸子-花笠むすめさみしがりやのマドロスさん/release/13389680
https://www.discogs.com/小林幸子-小楠公チビッコ船頭さん/release/13389750
https://www.discogs.com/小林幸子-出稼ぎ父ちゃんの歌/release/11074865
https://www.discogs.com/小林幸子-Sachiko-Kobayashi-青い太陽/release/10645313
https://www.discogs.com/小林さち子-お好きな時に/release/10991690