Try Musician's Friend during one of their sales. Right now they have a couple going on with "holiday" and "blackfriday" coupons. The trick is you have to actually call them and ask about a discount to match the coupons when it's Martin and some others. Sometimes they will give you that discount over the phone to match the current online promotion, even though the code does not work if you try it on the website.
Just note that they don't inspect or setup instruments. They generally receive the merchandise directly from Martin and don't even open the box. Martin QC seems to be pretty good though. They do have a good return policy.