I mentioned in a thread here before that you can get a mould made in a dental lab in the states plus a carbamide peroxide gel from an ebay store, Z whitening, for about 70-80 euro all in. This is what an irish dentist will charge 300-400 euro for. I would recommend getting a check up before hand to make sure there are no cavities/issues before hand. You will be get everything you need in a pack; putty to make the mould for your teeth (which is then sent back to the dental lab and you will receive your custom whitening trays within 10 days), full instructions, and a choice of either generic whitening gels or the brand names such as opalescense, zoom or night white. There are probably others on ebay but I have used this store in the past as it has 99.8% positive feedback and has sold nearly 9000 products. You can also ask the seller questions about whitening. I am not affiliated with this store in any way just wanted people to know whats out there as I have seen the crazy prices out there.