They actually have an entire section on languages at most book stores (it's like 4 bookshelves at my local Waterstones). They also have cassettes/CDs/DVD. It's better than following someone's badly written guide on Google or that weaboo who does Japanese words every week on Youtube xD And if you need money, get a job :lolface:
There are so many sites, and believe me, I tried out quite a few of them, but I wanted to know if there were any anyone could recommend.