Electronics retailer Best Buy has begun preparations for the launch of the iPad on April 3rd, according to a Mac Rumors report. Citing unnamed sources, the report states that the iPad will initially be offered only at Best Buy locations with a dedicated Apple “store-within-a-store” — approximately 675 of the company’s 1,000-plus locations — and will not be available at bestbuy.com. No early openings are planned, according…