Eurostar travelers help needed

Sorry in advance if this is not the right place to post this question.

I am a little confused about the fares for an Eurostar ticket since I am finding a lot of contradictory information searching in various web sites.

I wish to know the exact price of a Eurostar ticket from London to Paris, both one-way and return, departing from London between 7 am and 8 am, in second class and with the lowest fare available.

I also want to know if there is a significant difference in the price if you travel monday to friday or saturday/sunday.

Please, don't search the internet for it since I already did so: what I want is the advice from people who often travel to Paris this way.

Thanks

Ricardo