The question I get asked most by homeschoolers is "What course should I buy for my high schooler. They need the equivalent of at least 2 years of high school instruction". For French and Spanish, the answer (in my opinion) is easy -
"Learn to Speak French" and "Learn to Speak Spanish" software programs. The current version of the Spanish - with 4 CD-ROMs and an audio CD is $20.00

The current version of the deluxe French edition has 4 CD-ROMs, an audio CD, a DVD, a workbook, a microphone and a travel guide for just $25.00. (Our prices at www.wor.com) Despite the low prices, these programs are the equivalent of at least 3 years of high school French or Spanish. The grammar in each goes up to the subjunctive, each has speech recognition and videos of the people speaking, as if you are talking to a real person trapped in your computer. The French version offers 10 little videos (about 2 minutes each) on different cities in France and the Spanish version has 10 little videos on Mexico. Each title has a beginning section for the basics and then 30 topics to choose from. 

I will never forget a year ago, a 17 year old girl telling me she had used a certain curriculum for 2 years. I won't mention the name, but it cost over $100.00. She said, at the end of it she could talk about princesses and castles, but could not ask for change in a Mexican restaurant.  These programs will enable you to carry on real conversations. Also, for a foreign language, buying a curriculum is NOT ENOUGH.  You need to watch films in the language, read fiction, etc. to really learn a language and be able to communicate. You don't want to spend all your money on just the curriculum.