Like others, I haven't had too many problems with ordering things on-line. If ánything, it's just having to wait for the delivery. I try to get as much stuff as possible in one order, rather than ordering piece-meal, and having a delay in finishing the kit (I can create my own delays, thank you!).
My most recent fiasco, though, was with a seller on Amazon: when I contacted the seller, they first denied they had an order from me via Amazon, then, they told me the order number was wrong, and finally, they just gave me a lame "the order is shipped", but no tracking number. I found the tracking number via Amazon, and then USPS gave the package a tour of the east coast before it finally got to me. Last time I order from them.