The easy way is the money way - buy backlinks left and right from text link brokerage sites. That way you dont have to bother with reciprocals and link backs. Or you can join a link wheel, blog farm or blog network like linkvana or myarticlenetwork.
You should participate in do follow forums by interacting and sharing your knowledge. And put your link signature.
The easiest and directest way is purchasing them if you can afford them.Or you have to ask others to exchange it with you.It'll cost you much time.
To get easy back links, do link building social optimization make signature links article submission directory submissions. By doing all above these, you can get easy back links. Links from social optimization websites are v good worth.
Bompa - if I'm correct buying them is not against T&C, but selling them is - so you may find one day they disappear.... I've seen this question asked so many times the easy way is just ask. Though - you might want to consider whether it is actually the right question. perhaps you should be asking yourself what are the hardest links to get? What are the most valuable to you? Everyone talks numbers, it's quality that counts too...