There were a couple of us who wanted to set up a blog with a league table of twenty or so staple products and the cheapest places on the island to buy them.
But then it was pointed out to me that prices are highly dependent on supply, demand, when the last boat came in, the weather, you name it.
So it got kyboshed. Still think it's a good idea tho...
Inkblot - you know, the reasons you list are actually reasons to create such a blog, not reasons not to create such a blog. Your concern (I'm guessing) is that the prices change quickly and arbitrarily. That will insure - for example - that store owners will alert you to changes in their prices, and so will users.