$25 is a good price for two metal seed plates especially if they pass all the durability testing with flying colors. Free shipping worldwide is a highly commendable option you have given your customers. I am not sure about the t-shirts though. I don't see a big market for that.

Your shop accepts payments via credit cards and a stablecoin I have never heard of called uUSD. Do you have any plans to support bitcoin or some of the more popular altcoins? PayPal would also be a good option for those not comfortable entering their credit card details in a random website.

On a different note, the link in your post doesn't take us to the shop. It takes us to your Twitter page announcing the shop, and from there we get the link to the shop. Maybe it would be better if the link took us to the AirGap shop directly.