For some reason people (including LP) continue to be very cautious about getting a visa at the border, and there doesn't seem to be much from people who come from Jordan.
I took a taxi from Amman (11JD) and had no problems, other than being charged an eye watering US$75 for a visa. As soon as the immigration guy saw my passport he told me Australians pay $75, go and get my temperature checked by the doctor, pay the cashier and then take the papers to him. It took all of five minutes, and no mention at all of not having a visa. The fee als seemed genuine as he gave me a reciept - but I haven't met anyone else who paid such a huge amount - but as the fee in Australia is $100 so I can't really complain.
I also met an American who paid only $18, but had to wait a couple of hours.
Seems anyone can get a visa at the border - but some people have to wait.
One word of warning - the immigration guy lied to me and told me it was a multiple entry visa. When I tried to enter Lebanon I checked with the Syrian immigration and they told me that border visas are never multiple entry - so I didn't get to go to Lebanon.

