I believe it was Amazon.co.uk and the brand was "Power Hero". If you go that route, go with a higher than the voltage you think you'll need - that way when you later start adding American "toys" to it you'll have enough power to go around.
Don't forget to bring a USA extension cord as you'll not find them over here easily. (Different plug shapes.) Would avoid a US surge protector, though. When we plugged one into the PH it tripped our UK flat's fuse. Just an ordinary extension cord worked fine for us when we also wanted to plug in our USA Christmas tree lights. Our unit easily ran all our US electronics and also the tree lights at the same time. It is absolutely silent, too. It's just a little clunky looking and not the smallest thing on the planet.
In looking through my back orders, it's this one we had several of. Sorry we couldn't arrange a swap - I just donated two of them to the Prince & Princess of Wales Hospice shop here in Glasgow. They said they were going to put them on their online store site. They don't seem to be available on Amazon at present, but they are selling a 1,500 watt unit for £72.
Power Hero 1500VA 1100 Watt Step Down Voltage Transformer for Powering US 110 - 120V Appliances in the UK or Europe
Good luck!