you will probably find more acurate info with mail addresses, you can send out those in bulk, i've hread some companies sell addresses and some can do mailings as well, prices vary, but not redicilously high.
for his biz this method probably safer than emailing - you can't varify if those email are goe-targeted - more chances in getting ripped off. don't see no problem spam-wise, he's going to have all contact info in email and sent out once, right?
http://www.google.com/search?num=50&...s+geo+targ et