As for finding only plunging necklines...wut? I went shopping last weekend and I only wear V-necks. All I could find were boatnecks. BOATNECKS! I cannot wear that shit. High neck are in.
I always try to minimize showing cleavage in my work clothes. I can usually find a few things at Ann Taylor! And yeah, thank goodness we are getting into sweater season. I'm cold at work anyway, so now I can just wear a sweater instead of wearing warm weather clothes and then putting on a jacket inside
I also try to dress modestly. I don't have cleavage but because I don't have any boobs most shirts end up lower/ showing more than I would like. I wear a lot of camis.