You could always take your amiga into a TV shop and ask them if you can plug it in lol. I did that with an MP3 player when I was looking for a Stereo/dock in Curries once. It annoyed the hell out of them but it meant I got what I considered to be the best system. And at the end of the day if you spend money with them they will soon stop been annoyed.

This was also highly entertaining when I walked into my local Maplin store brandishing a NES, a screwdriver and trying to figure out which resistors I needed to replace. Luckily the lady behind the counter was into retro gaming and she helped me no end. The manager however kept giving me dodgy looks. But I spent best part of £100 on bits, a soldering iron, testing meter and some other bits.