The Omani police have "upgraded" their website and I can't see any visa-on-arrival information in English any more, although some links do redirect to the "old" site.

OMR 20 = USD 56 which is quite expensive. Rather spend the money in the country itself...

But now that Qatar is visa-free for many western countries, can one avoid paying for an Omani visa by flying QR and passing through immigration at DOH? Will it be awkward to go in and out of Qatar on a short transit, and also not sure how to convince Oman immigration that this exists if they doubt it - any Arabic readers able to find a page which could be printed out that will at least encourage them to investigate further?