Official @Goldback exchange rate for 09/19/2023 remains $4.06. Best prices:
1 Goldback is $3.73 over at Defy The Grid
https://defythegrid.com/product-category/gold/aurum/goldbacks
100 pack of 1GB is $368.63 at Oz Bullion
https://ozbullion.com/products/nevada-goldback-1-note-aurum-100-pack-24k-gold-bills-random-year
50 Goldback is $177.75 at APMEX