I use Lego in my job and the "basic bricks deluxe" box 6177 was pretty much ideal for my needs (I own several).
But, now Lego have replaced the previous range of brick boxes with the new "Classic" range (10692 - 10698). They include basic bricks but also decorative pieces (flowers etc). They also seem to be considerably poorer value than the previous range of boxes! For example 6177: 650 pieces £20.99, 10696: 484 pieces £24.99! It also includes a lot of tiny pieces (cheese slopes etc) but what I need is building bricks.
Apart from Ebay etc, what is the best value source of basic bricks?