accomodation
For really cheap accomodation, use the camp site situated across Crystal Palace Park on junction of Westwood Hill/Crystal Palace Parade. Run by Camping & Caravanning Club GB i think...or one of those camping clubs. Its about a 5 min walk thru the park to the sports stadium. There are a number of small hotels in the surrounding areas of Penge, Sydenham, Norwood & Dulwich (Within 2 miles of CPP) which mainly offer B&B. Public transport from all these areas is good by bus as Crystal Palace is one of the main bus terminals in SE London.