As you already know, no one vendor has a good deal on everything - or sales on specific items that go on forever - or good quality, or even genuine products - so recommending just one, without knowing what the new vapist wants/needs/is budgeted for, is not such a good idea.
I'd like to be lazy too ;-) ... and recommend just one, but in good conscious - you can't.
As most start with eGos and clearos - I'd look for sellers of genuine Kanger, Innokin, Vision, Joye and Aspire - at fair to good pricing. Once the new vapist gets started and has learned a bit of "how things work" in the vaping world, they can search out their own deals on more advanced goods.
If the new vapist is a bit tech minded (or will even follow directions well), and has a modest budget - I usually aim them towards a Innokin iTaste 3.0 or MVP2 (self-contained eliminating the battery issue for the time being), then one of the previously listed brands for a few clearo/glassos. With a bit of research, around $65 or less typically, including spare coil heads.