As a westerner, if you're planning on getting cheap designer clothes in Cocha, forget about it. Expect to pay at least 250Bs. up to 500Bs. for a pair of jeans. Granted, 25 euro sounds like a bargain, but when you consider food costs ten times less than it does at home while clothes are only slightly cheaper, you'd be much better served doing clothes shopping in Argentina, which can be substantially cheaper than Bolivia.
The Spitting Llama is Bolivia´s only foreign language bookstore specializing in English, German, Quechua, French, Italian and more. They also distribute Lonely Planet Guidebooks. The store has a wide range of camping gear from backpacks and tents to leather hiking boots and original swiss army knives. They have tons of maps and tourist info as well. The owners speak english and spanish.
What to buy: The selection of Lonely Planet books covers all of South America and more.
What to pay: purchases range from a few dollars to as much as sixty.
It´s always fascinating to visit a market place in southamerica. La cancha in Cochabamba is a quite big market where you an find everything from fresh fruits to clothes or technical equipments. ´
Besides you can find a lot of professions here in the streets for a few money, as for ecample shoe makers.
What to buy: Almost everything
What to pay: For a shoe repair I paid 7 Bolivianos (~ 1.30 Dollar), the same repair in Germany would cost me ~20 Euro/Dollars. Imagine! And they did it better and faster.