Coupon is TESTANDCODE
I had already used it before realising it was one or the other, honestly its one of the better TLD’s IMO, too bad Cloudflare doesn’t support it yet.
Edit: I should have mentioned, you have to make a tentative payment of 1 USD, which is reverted.
Been using them for years and aside from a single domain at Google (rip) I have been using them exclusively for the last couple of years with around 10 domains. Hard to beat the prices and the support is top-notch.
And who doesn’t love a cute little piggie!