Official Goldback.com exchange rate for 09/27/2023 is $4.01.

Best prices:

1 GB is $3.66 (check) https://defythegrid.com/product-category/gold/aurum/goldbacks

1 GB is $3.70 (credit card) https://finestknown.com/product/2020-1-utah-goldback-currency-1-1000-oz/