[willystyle]

In my opinion, you should never use table salt to cook, as it's way saltier than kosher and sea salt, so it's difficult to measure how much to use (recipes never call for table salt, neither). Sea salt and table salt should only be used on the finished product.

Some would argue that sea salt could be used for cooking; however, you would miss out on the essence of the taste of sea salt, and it would be also be a waste, cause sea salt is generally more expensive.

Now, in my opinion, Prime rib is prime rib, meaning that if you are not cooking a prime-graded standing rib roast from the rib section, then don't call it prime rib. Just call it Roast beef or rib roast, as the difference in taste and quality is highly distinguishable.

I've had a friend that cooked a inside/outside round roast for a gathering, and called it a prime rib. Others didn't notice, but I could tell. It was embarrassing on his part, but I didn't have the heart to tell him. So let's not make the same mistake twice, guys.

As for buying Prime rib (prime grade), Costco seems to be the best deal, but it's only available during various times of the year (Christmas, for example). Otherwise, you'll need to go to a local butcher, and please don't buy it from local supermarkets. They are not prime grade, unless you go to Urban Fare, and other high-end supermarkets.