The Apple Online Store I think you mean.
It reappeared there at the beginning of the month. Looks like the volume of calls asking for it woke someone up.
Lion is still only available by phoning Sales and getting a download code for the App Store.
In the US, call 1-800-MY-APPLE and ask for a sales assistant.
Apple UK Sales; 0800 048 0408 (freephone) or 0871 508 4400 (beware - premium rate)