can we ever special order metal ones?
AFAIK: No.
I want a payment address for my website though it has to be the same one every time
Ideally you would give each customer a unique address. That way you know who paid and when. If you give the same address to all customers how do you know who paid you? Also, given your one single address for all payments I, your competitor, can easily see a record of all of your sales.
But yes, you can do it that way if you can figure out how to match payments to customers...