What is the best "real" paper for greeting cards?
I'm looking for a paper that shows some decent quality and outstanding finishing for greeting cards. I found some papers that are more like a regular ones for children but I like ones that are bright and quite thick for Inkjet printers. I found in redriver papers a luster or pearl one that have some similar results as a Professional greeting card, but they are just single side, and I like both side printable paper. I know that there should be in some places the paper that at least seems to be more professionally like those sold in hallmark or American Greetings. Does any of you where can I find those Kind of paper for Inkjet printers? 
If you haven't found the papers you want at a large office supply store, and you aren't interested in those blanks that are sold for the purpose of printing greeting cards on a laser printer, for example
those made by Avery. http://www.avery.com I can't give you a direct link to the page because it's one of those impossibly long URLs, but just search for "inkjet greeting cards" on the site and you should pop up what they carry. Other companies making computer papers and office and craft supplies also make these.
Next stop is to try any large arts and crafts stores like Michael's or Hobby Lobby. You can go where they keep large sheets of art papers, which includes all sorts of drawing boards and papers meant for fine artwork. You also want to check out the section devoted to scrapbooking and stamping. There are lots of different kinds of decorative papers with different weights available, plus other items that you might want to use to make your cards. Stamps, glitter, inks, decorative edge scissors, hole punches, stencils, lettering, etc.
Then be realistic. There is only so much you can expect a home inkjet printer to do. The cards at Hallmark and American Greetings look the way they do because both companies have the very best of every kind of professional printing equipment imaginable. It's not just the paper. Furthermore, if you are thinking of selling your creations, people who buy handmade cards like them because they
DON'T look like the mass-produced ones that they might feel are a bit impersonal.
That's why big greeting card companies actually have a section of cards that seem to be more "handmade" (and perhaps some employees on an assembly line actually did hand-glue that piece of lace onto the cover).
Definitely check out the arts and crafts stores. You find something to really inspire you. You can also go to a store that specializes in fine art supplies for artists. They usually care really big sheets of very beautiful papers of all kinds. I've seen handmade papers with actually gold leaf, silk paper, rice paper, etc. These papers tend to be very expensive depending on what they are, and some probably would jam up your printer.
Don't overlook the possiblity of using one or more papers for your card, or taking two sheets of paper and putting them together. I've made cards using one of those card blanks and printable vellum paper. Vellum for computer printers looks very much like regular parchment paper. I print the same design on both the card and the vellum and then put the two prints together to form one image. Instead of glue, I use those self-adhesive glue dots (also available in office supply or art/craft stores).
I've printed black and white images just so I could hand-color them using watercolor or colored pencils so they had that "vintage" look. The colored print was then used as my "master" so I could print more than one copy and any wrinkling of the paper in case I used too much water in the water color could be minimized or eliminated in the final product.
There are many many ways you can alter the finish of your paper. They actually make very, very fine glitter that can add a very pearlescent sheen to your card if you use the correct glue or adhesive to put it on.
Sorry, if I got off the topic of "real" paper, but I think you might be missing the point of making your own greeting cards.
Now, if you wanted to sell your design to a company like Hallmark or American Greetings, they would do all the fancy printing for you if they hired you on. However, I don't think they take unsolicted artwork since they have staff artists who work for them. Once in awhile they do have art contests open to the public, and the winner does have his or her work reproduced as real cards for sale at stores.
http://www.hallmarkcontests.com/
http://www.americangreetings.com/printables/ (not a contest, but something that might interest you)
A look at what is currently available on eBay
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