Hi Cnopicilin,
Paper models are entirely different than Plastic. Unfortunately, they are not available in any store since they are not well accepted by the modeling community in the US. They are extremely popular in Poland and other Eastern European countries. The best way to order a model is online. There are several forms:
-A pre-printed booklet which is a complete kit. No boxes and sprues.
-A digital download after paying with a credit card.
-Free download from the author.
Because paper models can be easily scanned and printed, piracy is rampant. Be sure to download only legitimate material! There are enough legitimate free models to keep you busy for quite some time.
When printing be sure to have a good color printer and heavy card stock, or you model will be floppy. Sometimes cardboard (like from cereal boxes) is used for internal structural support. Be sure to have an X-acto knife, and tacky glue (Aileen's).
Models are usually designed by computer these days, though some old kits were drafted by hand.
Some links for the curious :
http://www.papermodelers.com/ Forums for card modeling in the US. They have a free download section.
http://www.papermodelstore.com/ An online store in the eastern US. Great service. These kits are in book form.
http://www.ecardmodels.com/ Another online store, but these kits are digital download.