If they are not a Trek dealer, they cannot.
I get that question all the time "can you order any bike I want??"... sorry.
Becoming a dealer for a specific brand is a tedious process, almost political. And you cannot become a dealer just to sell one bike.
Tho that doesn't neccesarily hold true for the small niche brands. But usually even they have minimums.
edit to add.
I am a Giant dealer, so some may say biased. But in this case (as is always with me) I say go with the bike that really calls to you. BUT like you even said, having a shop that has your back is HUGE! So if you like the Giant enough that you will not have buyers remorse, and pine for the trek after the fact, you may want to go with the Giant. You have to decide. I just know from past non lbs owner experience that as a woman, having a shop you are comfortable in is HUGE. You want to look forward to when you have to take the bike in for tune ups and such. You want to enjoy your time and interactions with your lbs, not dread them.
OTOH- if you feel that by buying the Giant you are missing out- get the trek. They are both equally great bikes. You can always buy the trek and pay to have it serviced at the other shop. We tell people all the time to shop around, and to buy the bike that speaks to them, sometimes it's from us, sometimes it's not. But we welcome them back, and help them with whatever they end up purchasing regardless. (keep in mind that if the Giant dealer has been spending a lot of time with you, and you walk in with a Trek they may be disappointed. It's human nature, but they will come around.)
Hope this helps



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Sometimes it takes a few rounds to figure it out (even though in your mind, it may already be decided--you just have to discover it since so many factors influence a decision!)
