Ron, welcome on this messageboard! It's great meeting more and more Alpina nuts here!
One of the board members in Canada, 'Barnfind B7' had one that he imported from Japan. If I recall correctly he might be looking to sell the car, a B7 Coupe. Here is a link to his postings:
One of the issues you will come across is that if Alpinas were never officially imported to Canada, the car will likely be registered as a 530i or 535i instead of Alpina B7. But 'Barnfind B7' should be able to advise you on this. A second issue is that many cars have been reshelled over the years, so they are no longer original.
With regards to the price...its worth whatever somone pays for it...I think a fair price would be between $10000 to $20000 for an original car in good condition...not mint, but also not a basketcase. A more accurate price would be very difficult due to the relative rarity of the cars and the resulting difficulty of determining a fair marketvalue.
Depending on how much of an issue importing of cars is, you may want to consider buying a car in Germany and importing to Canada. The market value of a E28 B7 in decent shape in Germany is around DM12000 to DM15000, for a E24 B7 probably around DM20000 to DM25000. E12 B7s in original & working order are getting increasingly difficult to find.
Another guy to contact would be Frank Haas (www.nolimitz.com/alpina_b7
) based in Washington State, I'd consider him one of the top Alpina B7 experts in North America (he has 2 E12s).
Hope this helps.