I avoid aspartame, but I do use Splenda, which I mail order from Carblife (www.carblife.co.uk). They only seem to sell the sort in the little packets. They have a flat rate £5 postage, so it pays to buy lots of things at once - they sell the most delicious LC chocolate, though it has dire effects if you eat too much at once!lol.
I don't use Splenda often, but if I make almond muffins or chocolate coconut mockdanishes, I use it.
I agree with the idea that its probably better to wean ourselves off sweet things, which by and large I have, but its nice to have the occasional treat!
Hope this is helpful, Jay