Thanks for your replies guys. I was always wondering where to ask about "out of stock items" since this option is not mentioned in the support tickets section (maybe "general enquiry"). Maybe some approximate information displayed next to "out of stock" would help a bit. (Something like "expected availability - 1 month, or exp. av. 2-3 weeks, or exp. av. unknown, etc.). Maybe I will post this to suggestions as well.
Thanks for the info Maxim!