craftgrrl | making my own postcard

I looked through the FAQs and couldn't find it. I want to make my own postcards on the computer, print them out on regular computer paper and then paste it onto some cardboard medium. My problem is finding a good thickness/weight cardboard that will be as close to a normal postcard. Does anybody know what kind of cardboard I can use? I just would rather not spent a ton of money on "special" paper just to print out a few of my own postcards. And of anybody has some tips about this or had any experience making their own please share. =)

thank you very much!