from lxml import parse

doc = parse('http://services.runescape.com/m=itemdb_rs/top100.ws').getroot()

obj = {}
cells = doc.cssselect('tbody tr[data-item-id] td:last-child')
for td in cells:
    obj[td.get('data-item-id')] = td.text_content()

print obj

#obj now contains all data in the format {"2":"107.6m",...}