Just thought i'd post my experience of RC Timer.
I ordered some carbon props about 2 weeks ago and they arrived today. Nothing extra to pay when they arrived - always good
They needed a little sanding to balance - not loads and they fly great. Quad is MUCH less twitchy on hover and the props seem quite a bit quieter. All in all very pleased with them. It was around $30 for 2 full sets of 10 x 4.5 props, so very good value.
I'd have no hesitation ordering for RC Timer again - fast (free) shipping and great quality product