Recently I have been going round various shops looking for g/f products. Last week I went to an oriental supermarket. There were several rice noodle based products that I bought. I also took a chance on some rice crackers - not what you would expect really - they looked like uncooked pappadoms. But they are great - two mins in the microwave and they are like giant prawn crackers! I was really surprised how good they are.
The shop I went to was a new Vietnamese supermarket - top end of Walworth Road near Elephant and Castle, SE1 - can't find it online but it is near the junction with Larcom St.
The company that produces them is called Longdan. They have quite a few products so I guess they are available in oriental supermarkets elsewhere. The ones I got were labelled 'rice cracker with white sesame seed' but there were a couple of other varieties. They don't look much in the pack, in fact they look decidedly lacklustre. I was totally surprised what they turned out like. Really, give them a go