you could try connectme.com. you can start with 25.00 & if you bid way low you would get some traffic. problem with that though is when i used them that way it sometimes took forever for the money to run out. which means no traffic was coming steady.
you could bid higher but the traffic would probably be better but your money would run out sooner anyway that is one way you could go on a cheap budget.
i also have a VERY LIMITED budget so i know how it is. i found getting on search engines is necessary cause its free. google & msn are the ones i focus on.
i don’t use connectme any more. but you might try them and see how they work for you. good luck. your gonna need it with the search engines ha ha. at least i’m finding them FUN!!!