Here are some of my favorite guinea pig resources, supplies, and shops.  I hope you find them valuable, too.

Resources for Guinea Pig Owners
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Guinea Lynx

The BEST guinea pig care and medical information website.  Up-to-date, concise, and ad-free.  Download a free Guinea Lynx Care Pamphlet, or order the Guinea Lynx Cavy Health Record Book.
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Ginny and Sakura enjoy their two-level C&C cage.

Guinea Pig Cages - How to Build a Cubes & Coroplast Cage

Excellent website detailing how to build your own C&C (cubes and coroplast) guinea pig cage.  Sakura and Ginny loved their spacious cage.

KMS Hayloft
KMS Hayloft has supplied lucious hay and high-quality pellets for guinea pigs for years.  Ginny and Sakura were especially fond of the 3rd cut timothy hay.