Easiest way to get the Barons would probably be to call any sneaker stores in a reachable vicinity of your house around a week prior to release and ask if they'll be getting them. Online, on the retail side, the most popular choices are Nike.com, Finishline. com, Footlocker.com, ChampsSports.com, and JimmyJazz.com. Follow them all on Twitter if you haven't. But really, all you have to do is be active in the Baron I's thread. Dudes will post links when the time is right.
On the resale side, there is a Buy/Sell forum on this site, ESS OH EL EE (sound that out) Collector has a marketplace, eBay (be wary) is a big spot, Instagram and Facebook have Sneaker Selling pages, Kixify (be wary), and as a last resort (LAST, LAST, LAST RESORT. ONLY IF YOU JUST CAN'T BRING YOURSELF TO PASS ON A PAIR) Flight Club NYC/La and RIF.LA have them.
That's pretty much the starter's guide. Remember what I said and read the threads of the shoes you want. You'll absorb more knowledge as you go. I figure you're probably a young dude, so let me give you a few last pieces of advice no one seems to pass down down anymore: Never forget that they're just shoes. You don't NEED them. Practice self-control (don't pay these crazy resale prices man), and finally, wear your sneakers. Happy hunting