DS is 3 so only in nappies at night. I use flushable liners and can't seem to buy them anyway round here anymore. I used to be able to pop into any Boots and get them but they have stopped selling them for some reason. I live near a very big Mothercare but even they only sell Bambino Mio or their brand (both of with are incredably over-priced) and even then they only have the nappies, outers and 'start-up sets'. Mothercare don't even sell nappy pails anymore unless you buy the whole kit.
I thought the use a reusables was on the up but maybe not.....
I gave up on the flushable ones because I had to drive across town to get them. So I bought a cheapo fleece blanket and cut it up into liners and havent bought another one since (just shake poo into the loo and wash...) And actually since then I have started to make my own nappies and i do the inside with fleece so I dont need a liner!
I have Popli ones - they are cellulose rather than paper, and much softer than paper ones, but still flushable. They also wash several times, so if they're only wet, you can use them again, which means they are much more economical than the paper ones, although they cost a bit more in the first place.
I made some fleece liners myself - got a nice piece of fleece material from ebay and cut to size myself - very easy to do and still have loads of fleece left to make more for bigger nappies as we go. They rinse off really easily to remove the bulk of solids and wash up - not to mention lovely and soft against her little bottom when she wears them!