Your first choice in affordable linen tablecloths are the "look-a-likes".  These can include "linen-look" paper tablecloths or "linen-like" tablecloths which are actually linen blends.  The cheapest, of course, will be the paper, followed by linen blended with cotton or polyester.  Either of these choices will work well if you want the elegant look, but also a more "disposable" or easy to care for option.

For example, suppose you are hosting a casual dinner party, baby shower, large family gathering, holiday dinner, wedding shower or reception... all of which you probably don't do very often.  You may want "the look" but not the hassle or expense of pure linen.  Then, go for these "imposters".

(HINT:  If you are planning on re-using these tablecloths over and over such as for a dining area in an small establishment, know that the blends of linen and cotton, or polyester, will handle greasier foods and spills best.)

Your second choice in affordable table linens is buying wholesale or direct from the manufacturer.  Online is the best place to do that since there are no middle man mark ups!  If you need the elegance of linen and large quantities, then wholesale linen tablecloths will be your best investment.  However, do know that you can also get quality linen blends or pure linen tablecloths through reputable online merchants at that "wholesale price".