been to
ikea- the much loved sultan mattresses are being phased out and the new ones will take a month or so to arrive. they have a new one called "hovaag"

king koil- they order their stuff from the UAE and if sizes other than the ones displayed are requested it will take about a month to get it done.

sealy- contents are from the USA but assembled in Saudi. any size requirements can be catered to after 3 months though!!

approx 4500 and upwards for firm'ish beds.