At B&H, the 5DIII + 24-105 is $3,599 when you add it to your cart (it shows as $4,099 otherwise). That is just now, at 0900 EST.
The "kit" you get is likely to be a lot of crap you won't use, or want to use with a $3,500 camera. It is really not adding any value.
Buy from a reputable dealer. They won't try to scam you (some not-so-reputable dealers may try to sell you things that are included in the kit as "extras" like battery chargers, etc.), and you will be able to return it if there is a problem, or you just don't like it...