million obv egypt isn't oman but I haven't seen sma milk here. Mostly people here use bebelac and nan and similac. I read on a board that they have aptamil in Oman. I found some cow & gate but it was £30 a tub. If you can get SMA, it will be sold at the chemist not in supermarkets.
Nappies are super expensive here in Egypt, hence the reusables here. Egyptian made pampers in the green packs are about £4 for 32 size 4 but are not as good as the UK ones, the saudi made premium care ones have the elasticated tabs and are about £7 for 44. I imagine these are what would be available in Oman, though there are saudi brands like baby joy and bambi which are cheaper but a bit thick and bulky. I don't think I could personally be bothered switching to reusables during a holiday, especially with the thought of taking a wetbag around in the heat, but theyl nappies do at least dry very quickly! N is a very sweaty baby but is doing fine in motherease airflow wraps, which are better than the velcro versions in the heat. Bamboo and cotton are the best choices for breathability, I went for cotton because I don't think bamboo would survive the harsh washing powders and the heat on the washing line. One of my popolino wraps melted on the line last week and temperatures here are not as high as in the gulf.
Oman looks amazing though, I am so jealous!