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I used to use a plugin called Sonic Destructor, although not as much lately.
In one of my old tracks I got a pretty nice lo-fi sound by bouncing that part of the track, downconverting to 8/22, upconverting back to 32/44 for processing, throwing on a bandpass filter (maybe two, I forget), adding some artificial vinyl clicks and other artifacts, creating a stutter at the end (slow, not a "glitch" type stutter, it was meant to mimic a record skipping), and mixing it into a distorted copy of itself. That was the most adventurous I ever got.
Of course the best way to get a lo-fi sound is to put it through a chain that's actually lo-fi. Tapes, cheap mics, old stereos, AM or FM radio transmitters, whatever. I've also got a hobbyist-quality tube amp that's fun to use for that sort of thing. I know it's all out of the box, but it's not like it's expensive. 
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My party schedule:
2009-02-21 - DJ Attention @ I'm So Popular
2009-06-18 - DJ Annoying @ People Need To Know Where I'll Be
2012-11-32 - DJ Insufferable ɸ Or At Least the Stalkers I Complain About
2048-06-66 - Spastic & Whocares ¶ Although I'm Actually Flattered
9999-45-81 - Tweaker Gimp ☼ I Probably Won't Even Go To This But I Have To Make Sure I Fill Up All The Available Space Here
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