I got mine at finetuxedos.com. Couple of Ralph Lauren shirts. 100% cotton. Very nice quality.
Like you, I wanted to avoid pleats. A pique bib shirt is strictly, I understand, white tie only (tails). I got a pinwale shirt with a wing collar to wear with my tuxedo, and a subdued herringbone pattern shirt with a laydown collar to wear with a dinner jacket.
I would definitely recommend both the vendor and the shirts. 8)