we want to have a short breaks from london to paris for 4 or 5 nights with eurostar. Any body knows any place I can get the best price for the whole package
The 2 best priced packages I bought with the Eurostar were found on lastminute.com, my partner and I went to Brussels for 3 days and also to Paris a few months later. Might be worth the try, I don't know if ours were specials or just standard fares but both times the hotels were ideally located and they were very good 
Eurostar Breaks
Check availability for the best Eurostar deals with high speed train and central hotel.
The 2 best priced packages I bought with the Eurostar were found on lastminute.com, my partner and I went to Brussels for 3 days and also to Paris a few months later. Might be worth the try, I don't know if ours were specials or just standard fares but both times the hotels were ideally located and they were very good
References :
try at http://www.eurostar.com or at http://www.eurostar.co.uk and they do train + hotel + car deals.