The great news for a lot of readers is that all 4 *should* work internationally, so not just in the US and Canada. I used the word *should* because I didn’t use any of them myself, so I can’t make any promises/guarantees.
I think each coupon works for one domain but some discount codes can work for up to three, so it can’t hurt to try.
They should work for new registrations as well as transfers, you won’t be able to use any of them for renewals unfortunately.
All 4 will bring the price down to $1.99 + the $0.18 ICANN fee.
Here they are: