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)

tr = soup.find_all("tr", data-item-id=True) # http://www.crummy.com/software/BeautifulSoup/bs4/doc/#the-keyword-arguments - getting all the data-item-id trs
obj = {}
for thistr in tr:
    BStr = BeautifulSoup(thistr)
    td = BStr.find_all('td')
    obj[BStr['data-item-id']] = td[5].string # http://www.crummy.com/software/BeautifulSoup/bs4/doc/#contents-and-children - You can just keep working with bs after the [n]

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