Mcmaster.com is the best e-commerce site I've ever used
I don't fully agree with the slider the author is sugegsting.If my price range is 21 - 45, I don't want to fiddle with a double tick slider dragging it pixelwise to get to the exact numbers I want. Not everyone has perfect hand and mouse dexterity to move it a couple of pixels. Not some senior citizens.
 It's easier and faster for me to enter two numbers or just one number for the max. I don't need to enter a min number. Plus Amazon is already showing some popular ranges. I think