Most of PG's stories are on DC Universe if you're in the US and have $8 to burn. Not the JLE stuff (because Gerard Jones is a creep, or at least that's the only reason I could figure out) but her series, Justice Society of America, JSA All-Stars, Classified and some others are there last I checked. Definitely a great way to read those if you don't have them on hand!
Since we're all talking about our exposure, I think mine was just in JSA. I was liking the book and Black Canary left, which bummed me out and they replaced her with Power Girl? I looked up who she was and the tortured history (at that point) was a headache and a half, but damn if Johns didn't figure out how to reintegrate her back where she fit best. She quickly became a favorite and I started hunting down issues she appeared in backwards and forwards. She's easily in my top five now, usually around 4th or 5th but sometimes she punches up a bit higher.
Imagine my surprise when she was trying to hook up with Hal Jordan, Aquaman (prior) and eventually Carter Hall (then-recent). I'm convinced she doesn't date much anymore because she knows her radar only picks up extremely complicated dudes destined to end up in shitshows.
The worst thing about PG is that, unfortunately, she's got two really annoying sets of people dogging her: those who are obsessed with her figure and those who are obsessed with trying to fix her when she's just fine. I'm afraid she'll never be able to get away from either and I'm certain that's why DC tried to distance themselves from her after the New 52 and their plan to make her a new face of DC seemed to fizzle out.