Resources

Competition Math for Middle School
Competition Math contains over 700 examples and problems in the areas of Algebra, Counting, Probability, Number Theory, and Geometry.
Available at Amazon.com
Books recommended by Berkeley Math Circle (various levels)
The Berkeley Math Circle's list of required and recommended books.
Available at Amazon.com
Eleven Years Mathcounts National Competition Solutions
Available at Amazon.com
Mathcounts State Competition Preparation
Available at Amazon.com
Math Olympiad Contest Problems for Elementary and Middle Schools
Available at Amazon.com
The Art of Problem Solving Series
(Various Books for Elementary, Middle School, and High School)
Available at Amazon.com

MathPath
Camp focused on Middle School Math
Star League Math Camp
Camp focuses on Middle School and High School Math Competitions
Prove It! Math Academy
Camp focuses on Proofs
AwesomeMath
Camp focuses on Competition Math

Prove it! Math Academy Camp
"Prove it! Math Academy is a summer mathematics program taught by experts — a unique, high-quality resource to help motivated, talented high school students reach their full potential."
The Hampshire College Summer Studies in Mathematics
HCSSiM is an intensive six-week encounter with college-level mathematics for talented and highly motivated high school students
ROSS Mathematics Program
The Ross Program at the Ohio State Universityis an intensive summer experience designed to encourage motivated pre-college students to explore mathematics.
PROMYS
Program in Mathematics for Young Scientists
Star League Math Camp
Camp focuses on Middle School and High School Math Competitions
AwesomeMath
Camp focuses on Competition Math
SUMaC
Stanford University Mathematics Camp