You're missing most of the popular ones, so I'll give you a hand with those and some less popular places.
Facebook
Lolita Sales in English - the most popular sales group on FB.
Lolita Offbrand Sales - as stated, offbrand. Also, replicas are allowed to be bought/sold here.
Classic Lolita Second-Hand Sales - not as popular, but easier to sift through if you're specifically looking for classic.
Livejournal-based groups
EGL Community Sales
Angelic Poodle - Angelic Pretty sales
BtSSB - Baby the Stars Shine Bright sales
Innocent W - Innocent World
MoiMemeMoitie - Moi-Meme-Moitie
I haven't listed any that are super dead so if you're wondering why
x brand isn't listed, that's why.
Lace Market - A newer website which is gaining popularity, auction-style.