$100 a week ...lol...thats my starbucks coffee budget! but anyways, building up traffic overall will be different for different sites, people, etc. There are actually a ton of methods you can use and try. It was already mentioned here about creating free sits and adding those to link lists and directories; search engine rankings, link dumps yes; even chatting and participating in forums like this one helps a lot actually because it gives you exposure with interactivity....there's adwords for google, yahoo, etc....adding your site(s) to toplists....and more...you will actually find many solutions in the adult forums with lots of member tutorials. One thing to note, is that buying traffic is ok, but it doesn't last. So try not to spend your money on that. Overall, as others say and will say, Search Engine traffic is ultimately the best to get.
It's all trial and error and doesn't happen overnight, so the key is be patient but don't give up
