You didn't state new, so I will mention it. I have 6 sets of diving recreational regs sets listed for $100 each. I doubt you will find a better price. I would take $500 for all 6 sets shipped to the east coast.
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Does it have to come from the US and get container-shipped to Africa?
Just wondering if @BoltSnap might be able to get you set up or pointed to in-continent source(s).
ETA: Maybe someone knows some RedSea dealers that might be good supliers.