I have a couple of SAAS ideas for salespeople to help them improve their selling skills. However other than blogging to build an email list and PPC I'm struggling to think up ways to target salespeople.
Create a new email account. Sign up on every form you come across on websites selling various products and services. Get ready to be spammed. When the sales guys get in touch, get them on the phone using a blocked number or a temp. While they are trying to make a sale, instead try to ask questions to get them to admit they have the problem you are solving and you can instead pitch them your solution.
This is creative, I like it. It made me think of how many problems that sales people have that go unsolved, this sounds like one good way to address them directly.
Don't just say "salespeople," define what they're selling. Car salesmen? Go to a dealership and talk to the sales manager, or get him on the phone; Real Estate? Call the local offices, go to real estate seminars, etc. You get the picture; if you focus on a subgroup, it's easier to target who you want.
Find a conference near your area. Pay for an exhibitor hall only pass. Then walk around the exhibit hall talking to the vendors. They are all sales people. IRCE in Chicago last year was $175 and access to endless sales people. :)
LinkedIn is the obvious answer.
SellerCrowd may not be a bad idea if you don't mind anonymous sources
Conferences are easy finds for sales people in the exhibit halls.