overmydeadbody - did you try these ones? because they are quite simply incredible.
the ones with fillings are cool too - I made some lemon cupcakse, hollowed them out, and put soem blackcurrant jam in before replacing the 'lid' and frosting them, and they were AWESOME too
and mamG I got a piping bag in wilkinsons, was only a couple of quid. woolworths used to do cheapo ones too (so sad it's gone!). alternatively, i used a cone of greaseproof paper with the tip cut off - it's messy, but not too bad.