Yes, it is still possible -- just type in asterisk (*) in the search box. Also, notice that there is now an "All" button next to each department name in the filter area -- it is there specifically to accommodate for the use case you are describing. For example you can search for "camp gear" without selecting a department first, then see in what departments Amazon has found matches in and browse the entire department without filtering by keywords. Hope it makes sense. Thank you for posting!
Fantastic! Keep up the good work man. One thing to note is that unfortunately it doesn't seem to be taking shipping costs into consideration when looking at items under a certain price. I'd set a price limit of $1 for example and I'd get tons of stuff under that limit, but with a shipping cost of $5.99 taking it way outside the limit. I figure that's less on you and more on Amazon though since I have the same problem there too.
You are exactly right on that -- for Marketplace (i.e. non-Amazon sellers) Amazon simply offers no way to factor in the shipping costs, supposedly because they vary by destination. One way to get closer to the "what you see is what you get" experience when it comes to total costs (assuming you have Prime) is to check the "Sold by Amazon only" checkbox in the filter area. That will exclude Marketplace sellers from the search results, so all your filters will effectively apply to the total prices you are going to pay (since shipping is free), and, most conveniently, sorting by price will be accurate too. You can also achieve accurate sorting if you choose the "sort by amazon price" and "sort by amazon" discount options rather that simply "sort by price".
Good advice. Thanks!