You need to be careful when you buy cameras, watches or similar goods. Fakes are common particularly in the markets, from the looky looky men or from the small tourist type shops.  If you are getting an unbelievable bargain then common sense tells you it will not be the real thing.  However if you buy from a reputable dealer you will always get a guarantee and the genuine article.  In the south of Tenerife you should buy cameras, DVD players, MP3 etc. from either Maya or one of the shops advertising they are main dealers for a well known brand e.g. Sony.

Also be careful when purchasing perfumes, again these are plentiful on market stalls or in the cheap tourist shops and fakes are common. The genuine products can be more expensive than in the UK if you buy in the airport however savings can be made of at least 30% on UK prices if you buy from the large Perfumerie shops of which there are several in the South of the Island. 

Sunglasses are on sale everywhere particularly from the street traders but again if you buy from the Brand Retailer you will make savings for example a pair of RayBan Wayfarer cost approx £65 in the UK and are €70 (approx £56) and Dior Aventura cost £110 in the UK and €110 (£90) in Tenerife.

Common sense says if someone is selling cheap designer products from a cardboard box, market stall or sovenier shop they are not going to be genuine, but there is a market for this type of  'knock-off'.  You pay your money and you make your choice.