Sometimes it's by the cheese and cottage cheese rather than by the yogurts. Sometimes it's by the yogurts. Sometimes there's an all-natural yogurt and fromage frais section all to itself. It's a sneaky bugger!
my tescos do it but keep it with the cream and creme fraiche not the yougurts which i find a bit strange but they dont always have it, its the only place near me that does it
Some shops just don't seem to stock it. My morrisons doesn't do fromage frais, so I need to get that from Asda..but Asda doesn't do Quark and Morrisons does, so I need to go to about 3 different places every time I stock up!
The Waitrose one is nice, the Tesco one is OK too. I don't usually have any problems getting fromage frais or quark in either shop. But I think that the people who stock the fridges don't always know what category to put them in, so sometimes you have to hunt around.