EDSA billboard rates have been going up recently due to the increased demand for this cost-effective medium. There are some billboards on EDSA, especially the ones close to the Guadalupe area, which fetch close to half a million per month. The law of supply and demand actually kicks in. Depending on the size and the location of the billboard, rates can be either within the low side of 100k to 200k, or as high as half a million to a million.
The easy way to book an EDSA billboard is by clicking http://oohresource.multiply.com .