I've always felt safe with Newegg, ZZFly (Googlegear) and MWave, but wanted to save $$ on this first SATA system I'm building. Monarch had the OCZ ModStream 520W I wanted for $99 free shipping, I read comments at ResellerRatings.com and Pricegrabber.com before ordering.
Ordered around Noon Friday, got confirmation emails immediately, had tracking number by 7:15PM that night. Received item shipped from Decatur, GA to Austin, TX on Tuesday.
My guess is that quick of shipping is unusual, but I'm happy with my first Monarch experience.