Like John said, a lot of those "kits" on eBay contain a lot of filler stuff that is practically useless. You are definitely taking a bigger risk buying on eBay and sometimes you can come away with a deal. I think your purchase at BB was fair, saving a buck here or there on a package of accessories doesn't really help you a whole bunch, especially if the accessories aren't something you really need or want. I find it's much better to tailor the accessories to a few items that are what your really want.

Like John I recommend shopping at the big boys, such as Adorama, B&H, BuyDig, Beach, etc., they may not have the best prices but they will give you a fair deal and stand behind their product.