Official Goldback.com exchange rate for 07/11/2023 is $4.01, up one cent from yesterday.
After a review of online sellers' prices, the best price for an in-stock 1 Goldback is $ 3.66 over at Defy The Grid
http://www.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/50-nevada-goldback-aurum-24kt-gold-foil-note