Hallo,
I'm new here, too.
I'm not that much into Romance either, but I need more fodder for my 505 in March so I follow the freebies adverts. In case of Harlequin, just go to:
http://www.eharlequin.com/store.html?cid=1317
use your Internet browser not the Sony software and pick and download the books you like. I recommend to use ePub format. I can read them on my iMac using Adobe Digital Editions, but I'm sure as they aren't DRM'ed that they will work on 505, too.
And yes, the US Sony store is for US/Can citizens only, which sux a bit.
have fun