Looks like your options might be limited. Looks like the site vinnie gave only ships to USA and Canada (I may be wrong). If you don't live in USA or CA, then you'll have to find another source.
I checked Aspire's China site aspirecig.com but they don't seem to sell it either.
If you can't find that seal, then you may want to consider switching to other tanks that take that coil instead. Like the original Nautilus and Nautilus Mini, Nautilus GT, etc.
Hoosier has the Nautilus 2 tank on clearance for $10 but I have no idea if they ship to your country since you never told us what country you live in and "snow" does not tell me much. I'm not aware of a country named "snow".
Nautilus 2 CLEARANCE $10