Yeah it only Requires a Barter of 35.
Since your at 40 now, Concentrate on some other things, unless you want the pack rat perk.
Roving Trader hat: +5
Bennys suit/roving outfit: +5
Salesman weekly(with Comprehension +20)
So if your going to be doing alot of "purchasing" with a Merchant, but all that equipment on, and read that magazine, and you'll be sitting at 70 Barter.