Re: help! help!
I can only answer to your inquiry about electronic items. You can easily buy a voltage convertor from Best Buy here (assuming you are in the U.S) or or from any electronic store for that matter.
For answers to your other questions, wait till a local guppy replies to your queries. Regarding shampoons though, you can buy most of the brands however I am not aware of the ones you mentioned. You should take a couple of them with you but make sure you put them in the checked in luggage as they do not allow any liquid-based items in carry ons.