Buy an specific set of bricks I have a specific list of bricks for building a LEGO set that I found online, with approximately 300 pieces and around 70 different blocks. 

I have seen that one of the best ways for buying LEGOs seems to be Bricklink web page.
However, there are hundreds if not thousands of sellers, and the webpage does not seem to be designed to add a list and search for sellers or something like that. 

Has anyone been in my situation? How would you buy an specific set of bricks without going comparing one by one all the shops to see wich one has the mos amount of bricks etc?

If you have curiosity, I want to build the mini LHC
Please see my response to this post. Using the Wanted List feature you can upload your own list of bricks and then see which vendors have these items - you would still need to fill a shopping cart at each vendor to see their price, but that is not so difficult by using the "add Minimum quantity" link at the top of the individual shop page.