BeautifulSoupで、bidの107.206を抽出する方法はある？

s = '<!--{"rates":[{"code":"USDJPY","name":"米ドル/円","bid":107.206,"ask":107.207,"high":107.279,"low":106.254,"open":106.408'
s = s.replace('<!--{"rates":[{"code":"USDJPY","name":"米ドル/円","bid":','')
ここから先が分からない。