Official @Goldback_Inc exchange rate for 08/14/2023 is $4.01, up one cent from Friday.
After a review of online sellers' prices, the best price for an in-stock 1 Goldback is $3.64 over at Defy The Grid:
The best price for an in-stock 50 Goldback is $176.24 at APMEX:
https://apmex.com/product/255963/50-wyoming-goldback-aurum-gold-foil-note-24k