Seven Brides for Beau McBride (The McBrides of Montana) by Amy Barry

 Beau McBride reckons he’s ready for marriage. But his ego is bigger than his brain, and his little sister Junebug can’t trust him to find the right woman. So they make a bet, both placing ads in the Matrimonial News for mail-order brides. But when she discovers that Beau has already made his pick, Junebug decides to even the odds ... by inviting six more brides to meet her brother.
 
Ellie Neale doesn’t expect much from life – and life hasn’t given her much, except a head full of daydreams and her beautiful best friend Diana. And now Diana has answered an ad to be a mail-order bride – with some letter-writing help from Ellie – and she's leaving for Montana. Unwilling to lose her only friend, Ellie answers an ad of her own, which will take her to the same town Diana is headed for. But there's a hitch: when they arrive, Ellie and Diana realise they're here for the same husband. Along with five other women!
 
With seven brides vying for Beau’s attention, he needs to make a decision – fast. The only problem is, his heart longs for the one woman who wants nothing to do with him.