As a tourist you can indeed claim a VAT refund for goods bought while in Namibia, given the purchase amount exceeds N$250. You will need a valid tax invoice to present to the officials at the Customs & Excise Offices at the international airport. It is required that all documentation necessary be in order. You will need to fill in a VAT 16 claim form to be submitted along with the purchased goods and this is done at the VAT refund office (only at Hosea Kutako International Airport-in Windhoek). It’s not impossible, but on a good day will require some patience and time, so planning ahead is important if you wish to go this route.