import urllib2 as url

def getBetween(s, e, searched):
    sInd = searched.find(s)
    return searched[sInd + len(s):searched.find(e, sInd)]

def get(url):
    isHards = []
    isbns = []
    done = False
    for pg in xrange(1, 5000):
        html = url.urlopen(url + '?PG=%d' % pg).read()
        eInd = 0
        while True:
            sInd = html.find("<span class='regGray11px'>(", eInd)
            if sInd == -1:
                if eInd == 0:
                    done = True
                break
            eInd = html.find("</span>\n", sInd)
            foo = html[sInd + len("<span class='regGray11px'>("):eInd]
            isHards.append('Hardback' in foo)
            isbns.append(getBetween('ISBN10: ', ';', foo))
        if done:
            break
    return results

print get('http://www.textbooks.com/Catalog/KMG/Geometry-for-K-12.php')

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http://www.chartwellyorke.com/fathom/fathomdemos.html

http://isbndb.com/