Zeiss Gift Cert - 30% off any sport optics in the USA Zeiss online shop

As noted, no restrictions. You can purchase a $5000USD spotting scope and get 30% off if you like. 

You have to order from ZEISS directly and likely ship to the US address. 

All you need is the code, the cert isn't required, but I can still send it if you prefer.

Check out https://sportsoptics-shop.zeiss.com/  to see what's available.