Great stuff guys, but what i'm unclear about is why all the various websites people have used.
US citizen here, traveling to Vietnam (SGN) in April, so it appears eVisa is the way to go. But i'm not clear why the different sites. For example,
$17 here - https://vietnamvisa.govt.vn/ (this one mentions taking a "Stamping fee" as well as 2 photos....so i think that's more than should be needed, correct?)

But then the official govt site is this one (i think) which is $25? - https://visa.mofa.gov.vn/Homepage.aspx
or is this one the official one? https://evisa.xuatnhapcanh.gov.vn/we...trang-chu-ttdt (I believe this one is the best. i'm from USA, so eVisa is allowed. BUT....it looks like SGN Airport (Ho Chi Minh) is NOT allowed??? Is this correct? :-()

And then this is for eVisa good for 30 days, which is fine, we'll be there for 6 days, arrive and leave from SGN. Just not sure which website to use....and since SGN doesn't appear to accept eVisa, so what is the next way i need to go?