Its an interesting question, and while I agree with others that one-to-one tuition from a good teacher cannot be beaten, it does come at a cost and the context of the original question makes it clear that funds are limited.

A quick Google search found this, www.smartmusic.com , which at first sight seems to offer some sort of solution. Whether it fits the budget or not is another matter. I have no idea how good it is but it may be a starting point for you, Joe?