Official Goldback.com exchange rate for 07/10/2023 is $4.00, down one cent from Friday, 07/07/2023.
After a review of online sellers' prices, the best price for an in-stock 1 Goldback is $3.66 over at Defy The Grid
https://defythegrid.com/product/1-new-hampshire-goldback/
The best price for an in-stock 50 goldback is $184 over at GovMint.com
https://www.govmint.com/2022-50-wyoming-goldback-aurum-gold-foil-note-24kt