Well, my first search would be at ebay! I have also ordered parts from http://www.sewingpartsdirect.com/ with good results. Seems they have parts for many machines. You might also post a 'want ad' in a local trade/swap. Be sure to state the model of your Dressmaker.

where i do find the model number and thank you so much

http://www.sewusa.com/Threading_Diagrams�
https://www.google.com/search?q=dressmaker+sewing+machine+models&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Here are a couple of sites that might help you track it down.
Look for a plate on the end, on the back side, lift and look underneath. But the 'google' page might lead you to find out.
Or just type dressmaker s. machine into the google bar.

dancingirl thank you so much for the informationi will look there

Often sellers on ebay will offer "parts" from broken machines and you may find a foot pedal for your model. Another idea would be to check if there is a sewing machine repair person in your area and they could order a foot pedal for you. Find a cost first though, sometimes the repair places are small shops and will charge more than you would want to pay. tish

thanks i will try all these ideas

nanaofmany08..there has to be identifying information somewhere on your machine to help you locate the model number. However, a lot of foot pedals are generic and will fit several models. The connector pins mustbe exactly compatible to the connection on your machine...this might get you started on your search.

if you haven't found a foot pedal here are some sites to
try also

sewvacdoctor.com

a1sewingmachines.com