It depends on where in the world you are, as to what places have the cheapest/free postage.
For Australia, RS is free for any order, and next day (if in stock locally).
Farnell (Element14) is free for orders over AU$50, otherwise it's AU$15.
Mouser is free for (most) orders over AU$60, otherwise it's
, and 3-5 days.
Arrow is free for orders over US$50, otherwise it's
, and express shipping (whatever that is).
Arrow do require you to sign up for their free ArrowPerks program to get the free express shipping.
I'd prefer to keep using RS, Farnell are a pain to deal with as far as order tracking.
But TI have done this so choices are:
1. Order directly from TI, which I was thinking of doing for some orders.
2. Buy equivalent parts from say ST or On Semi, from RS.
3. Order from Mouser, as I already have parts I need but only they have.
Probably have to do all three, and live with having no way to get some parts quickly.