We like the odd thai curry, and have been getting frustrated with the price of the canned coconut milk. It's currently about £1.90 a can. With a little careful shopping we found that you can get it for 30p a can in Tesco at the moment. It's not with all the other coconut milk though, it's with the world foods. Hopefully there will be some other nice people out there who can benefit from having a hunt. This appears to be normal price, it's not a yellow label.
In the Tesco in Yeovil, it's near the back of the store, next to the staff only bit near the pasta.