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 Shoes | scans from Miller's | Roberta Barbiedoll | Flickr
Vintage Barbie Shoes Blue High Heel - Etsy
VintageDollPlaza - Makers of Doll Display Boxes and Dress Forms - Barbie - Reproduction Vintage Shoes Pack