One of my Loyal Readers asked if I had any resources for learning Latin inexpensively; indeed I do.
I'd recommend Peter Jones's Learn Latin, being the series printed in the London Daily Telegraph in the mid-90s and published by Barnes and Noble in 1998. You should find it at the store of the same name for $7.95. (You used to be able to read the same online for free, but that seems to be gone.) You won't be able to parse the Corpus Juris or the Gallic Wars with that course, but inscriptions, a little poetry, and perhaps some liturgy will be within your grasp.
For practice, I'd refer Loyal Readers to the Latin news service of the Finnish international radio service. Yes, really. They link to a small glossary for computing terms in Latin and will sell you Luther's Small Catechism in a recent Latin translation.