Taras and the other folks at Electronic Ash are wonderful!
I got my DSE901 starter kit from them, and it's all genuine SLB original stuff.
I've ordered from them a few more times, and they've always been great deals, very quick, and Taras has occasionally thrown in free surprises (he turned me on to their wonderful RY4, for instance!)
The only trouble I've had was with one battery coming unglued after carrying it around for a couple weeks. He replaced it with a new one without making me send the other one back while he was in the hospital recovering from surgery. Wow!
Their selection is a bit limited, but when I want something they carry, I only order from Electronic Ash.