I always go to Radioshack when I have some off the wall gizmo that I need to buy. I recently bought some new phones for the house. After taking out the phones from the packaging the fine print in the instructions indicated that I needed a DSL Filter if I had the internet bundled with my phone. Funny, that little detail wasn't anywhere on the box of the product.
So I just strolled into the store and showed the workers the literature of what I needed and they immediately plucked the product on the counter and I was outta there. That's how I like to do my shopping, no fuss and no hassle.