Parts seller/wrecker that was kindly provided by Lotz-A-Landies in the beginning of this thread provided so far an unbeatable quote. There was no point of going for second hand, as the difference was negligible.
There's one question that no one were able to answer as why battery became flat. From what seller said, LR Mel checked it a week ago when they replaced the alternator and confirmed battery capacity and lifetime is within normal. I bet there's a relation between drained battery and seized engine...
workingonit, parts dealer, if I go ahead and purchase the engine from them, promised to issue a full technical report on the old engine, as they are getting it back and will be pulling apart.

