I was searching on eBay for vintage footwear for my shoeless 60s Barbies (and shocked by the high prices) when I saw these Barbie Collector repro shoe packs (also super pricey now).
Vintage Barbie Shoe Bundle/Lot 4 Pairs of Shoes Multi Color | eBay
vintage barbie shoes, Hobbies & Toys, Toys & Games on Carousell
barbie accessories original & petite doll shoe pack- Multi color : Amazon.in: Toys & Games