The following lands are called shocklands:
Hallowed Fountain ({W}/{U})
Watery Grave ({U}/{B})
Blood Crypt ({B}/{R})
Stomping Ground ({R}/{G})
Temple Garden ({G}/{W})
Godless Shrine ({W}/{B})
Steam Vents ({U}/{R})
Overgrown Tomb ({B}/{G})
Sacred Foundry ({R}/{W})
Breeding Pool ({G}/{U})
They can be 'fetched' with lands called fetch lands that essentially can grab any land with the basic land type of one of their two colors:
Flooded Strand ({W}/{U})
Polluted Delta ({U}/{B})
Bloodstained Mire ({B}/{R})
Wooded Foothills ({R}/{G})
Windswept Heath ({G}/{W})
Marsh Flats ({W}/{B})
Scalding Tarn ({U}/{R})
Verdant Catacombs ({B}/{G})
Arid Mesa ({R}/{W})
Misty Rainforest ({G}/{U})

Note, most shocks are ~$10 or under, fetch lands are more expensive. As I said in my earlier post, these will be the best bang for your buck as far as your magic career as they will always be useful in any deck of the color of land, but on their own do not add a ton of power to your deck aside from making your spells easier to cast. Ideally, you go and build up robust mana bases and then come into stronger spells but everyone has their own approach to building up their collection.