yes, how difficult are the powder suppliers. the only brew I have made is years of home TREN and I am an addict. I can make about ten 4g kits in a few hours, and its sterile and more potent than ug labs...
not as difficult as you might think... since most powders come out of china, and there are no laws for it over there. There is one rather large chemical company in shanghai that manufactures just about everything you can think of. Finding a domesic supplier is another story though.
The key with kits (and the other gear) it to make sure it is coming from a trusted source. Some sites I have purchased from are researchlabsupply(dot)com and FinaFarm(dot)com. Kits are a bit more expensive but if it is a persons first time and they are not conformtable measuring stuff then the kit is the way to go.