Numerous DS lite deals around at the moment, most seem time limited. However, Dixons Tax free sell the DS Lite (most colours) for £85.10 in their airport tax free shops.
Yes I know that this is conditional on flying from an airport with a Dixons Tax Free, and yes, the saving maybe made up from the Tax Element, but, if you are after a DS Lite, and you are flying from an airport, and want to save several pounds, not have the hassle of deliveries, and have a sound receipt and guarantee in your hand for easy returns etc, this this is a good option. This price is not new but to me was the most sensible option when I bought mine back in August. Wasn't going to post it, but seeing deals recommended for DS Lites at more expensive prices make me think this is a good option. Bearing in mind the millions of flights made per year, this is not that selective either.
Meant to add, can't see it on t he website, but phone your local airport Dixons and they will put one aside in your name.