Do they sell Cookbooks anymore?

I upgraded plumdumpling's answer because, well, "How to cook everything" is what I had in mind when I clicked on your question. My wife's grandmother was a whiz-bang cook and had newspaper articles featuring her recipes. I transcribed the recipes, and it became clear that cooking changed in the 1950s when Campbells began featuring recipes using soups as a base. That thinking prevailed until frozen dinners became a big factor. And now meal kits are causing a further disruption. I'm not totally opposed to using prepared ingredients in cooking, but I try to limit it to the same importance as beef or chicken broth.

Two words. Mark Bittman. Check out his How to Cook Everything cookbook and all of its variations. The best!

Bookstores have entire sections devoted to cookbooks.

Two words Fannie Farmer - excellent cookbook and tried and true recipes.

Yes, they still sell physical paper bound cookbooks. I find them to be a pain in the ***, but they are valuable tools for learning how to cook. Also, most people just go online if they need a cookbook. The internet has every recipe you can think of for free.

Of course you can buy cookbooks at a bookstore or online. 

Of course they do.

Sure they sell cookbooks. 
Many cookbooks written in the 50's and 60's used "convivence" ingredients that made the "housewives" jobs easier since many were in the work force. 
Take your recipes that use cans of cream of whatever soup and make a white sauce base yourself then carry on with the recipe as written.  Easy to make it a mushroom, celery, onion, broccoli or any other sauce. 
Other packages ingredients like the dry soup mixes are mostly salt, beef or chicken base and dehydrated onions and you can do much better than that. 
Your cook or bake time might have to be adjusted as well as liquid amounts if you are going to use "real" rice in place of "instant" rice.
Box cake mixes can be replaced with a real cake recipe that you can find in a simple search on the web. 
Dream Whip (although you can still find it) can be replaced with real whipped cream or a frozen non dairy whipped topping. 

Yes? there are cookbooks ALL over the place.

Tons of printed cookbooks out there. I collect them & have over 100...while you can find them anywhere, I get the best deals at Ollies

Sure.I bought a big book of bread recipes awhile ago and keep a few pages earmarked for repeated use.Easier than looking up all the recipes on the internet.

Yes, there are tons of cookbooks available from bookstores like Barnes and Noble.

of course they do. Step into a book store and browse the cook book section.

Yes. There are about a million on sale right now. Google cook books

The evolution of cookbooks is actually really interesting, much more than it sounds like it should be. Besides the cheesy celebrity chef books out there where Rachel Ray might tell you 99 summer bbq favorites in a "1 cup flour, 2 cups water, stir until smooth..." fashion, there is a trend of espousing theory these days. They will say "the starches will break down if beaten too fast so you'll want to hit it in slow bursts ...." When I read those online looking for an oven temp or spices for a particular fish, I find it hard to get that info inside all the "then the summer breeze carries a touch of salt in the air, in my nose, on my tongue!" Cookbooks still exist but they kinda suck.

The two big schools of thought that traveled through time, overlapping for a bit were what I said, the chemistry homework for the 70s spoiled brat housewife and the 1880s indentured servant etiquette manual. Chapter one saying "a proper lady shall serve her bread warm by leaving it by attendance of spit-boy, not to dally for her virtue must not be put upon." Chapter 347 being "fold one's masters socks counter clockwise as to not invite none but Saints..."

Yes, they sell a lot of cookbooks and many of them have everything from scratch. You must not have been in a bookstore lately. Try Joy of Cooking.  Or Mark Bittman's How to Cook Everything.

Cookbooks sell So well that they may well be keeping places like Barnes and Noble open. Digital cookbooks are not what most cooks want.