MacRumors has word that Best Buy will be selling the iPad on launch day, April 3rd, but only at its store-within-a-store locations that sell Apple products. These are the roughly 675 Best Buy locations that have a dedicated Apple products section within them.
Best Buy has no plans at this time to open for business any earlier than usual on that Saturday of the iPad's launch. If you are planning to purchase an iPad at your local big blue retailer be sure to check their regular business hours before heading out. You can be sure that more than a few stores will have lines, especially in those metros that do not have an Apple store.
MacRumors goes on to note that Best Buy apparently has plan-o-grams that show a total of four iPads on display. What remains to be seen is what the fourth iPad is. It could simply be that they're going to have four of the wifi models in various memory sizes available for demonstration, yet there is some speculation that the 3G model might be ready to display at this time as well.
As is always the case with Apple new product launches, we will just have to wait and see how this all pans out. Just one more week!