Find and Replace using GREP for $ sign from right to left of 2/3 digit number

Hello, 

Im looking for help making a grep code in the FIND AND REPLACE window that can move all "$000 and" amounts to "000 $". The number changes depending on what the savings amount is, so it can be a 2 digit number or 3 digit number. 

Ex. SAVE $40 to    40 $ DE RABAIS

Ex2. SAVE $150 to    150 $ DE RABAIS

Right now i have to manually move the $ sign to the right of all the savings amounts for our English to French translation process and its takes a long time. I looked for grep style examples that would work for this but havent had any luck yet.