I often discover that when only one vendor says they have the part... they really don't have the part. With few exceptions, the vendors don't make anything, they re-sell. So if one guy has what you are looking for, then someone else will also and the decision of who to go with comes down to price. The "lone wolf" vendor may be misinformed, have the part miscategorized, or not really understand what they have (or what you want).
my $0.02
