A great place to start looking for curriculum is Cathy Duffy's 102 Top Picks. The book actually has a quiz to help you decide what style of programs may fit you best as a parent. Another great resource for classical homeschooling is the Well Trained Mind (Wise/Bauer).
Several online providers have a large selection of different materials all in one place:
Specific Companies - Traditional Programs:
Abeka Books (text, online, and DVD option
Alpha Omega ( textbook, online, and DVD options)
Christian Light Education/Publications
Peace Hill Press (now the The Well Trained Mind Press)
The Potter's School Online classes
Hands On/ Unit Study - a unit covers multiple subject areas together
Specifically Classical - The early years of school are spent in absorbing facts, systematically laying the foundations for advanced study. In the middle grades, students learn to think through arguments. In the high school years, they learn to express themselves. This classical pattern is called the trivium. Increased focus on the arts and Western Culture.
The Well Trained Mind (book, resources, online academy - great place to start for classical options/description)
Ambleside Online - free CM plan
Memoria Press (text and online classes)
Peace Hill Press (WT Mind Press)
Simply Charlotte Mason - free CM plan
Easy Peasy All in One Homeschool
A homeschool convention or bookstore is a great place to see the different supplies available. Greenville holds a large convention in March. (Great Homeschool Conventions) Learning Cycle in Greenville is also a favorite.