Official http://Goldback.com exchange rate for 07/13/2023 remains $4.03 as it was not updated.
After a review of online sellers' prices, the best price for an in-stock 1 Goldback is $3.70 over at Defy The Grid http://defythegrid.com
The best price for an in-stock 50 goldback is $178.79 over http://APMEX.com
https://www.apmex.com/product/255963/50-wyoming-goldback-aurum-gold-foil-note-24k