These cans are now out of stock in most places.
They were out of stock a year or so back too --- do they preriodically go out of stock?
I'm not sure about earlier in the year, I didn't have an issue finding them. Though the problem right now is that they've quit manufacturing them, though I'm not sure how quickly they'll go out of stock.
Edit: Yay finally a Head-Fi'er
From my point of view, the Sony XB500 does have more quantity of bass than a pair of XB700's, but the bass sounds very muddy. However, the Sony XB700 has slightly less bass, but its more refined and sounds better.
Have you tried the Sony XB700? What do you think about the bass on them if compared with the XB500?
Same thoughts here, I also preferred XB500 due to this for its punchy impactful bass and subbass was nearly the same on both, a bit more low-mid presence (the XB700 lacked there) and non-exaggerated highs. However in stock form I do find XB500 just a bit too muddy in the mids due to the upper-bass is too much forward (the frequency response shows it goes pretty linearly up to 300Hz before rolling off) so if you got an EQ available lower slightly 250Hz (1-2dB or so) and give tiny boost at like 1000 - 16000Hz (1-2dB or so) and it will sound pretty nice.
Yeah I will try what you said (EQ), one time I accidently changed the eq in my iphone to bass booster. and it was god awful mids were beyond muddy lol. Actually everything was muddy besides the bass.