from bs4 import BeautifulSoup

import urllib2 #http://love-python.blogspot.nl/2008/02/get-html-source-of-url.html

url = 'http://services.runescape.com/m=itemdb_rs/top100.ws'

usock = urllib2.urlopen(url)
data = usock.read()
usock.close()

soup = BeautifulSoup(data)
soup = soup.find_all('tbody')

tr = soup.find_all("tr")
obj = {}
for thistr in tr:
    td = thistr.find_all('td') #You're using bs4's methods here now.
    obj[thistr['data-item-id']] = td[5].string #still using bs4's ['attrname'] thingy here.

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