Thanks everyone for the suggestions.
One of the reasons I'm having my cousin do the shopping on the mainland is due to companies like Knitpicks adding on extra shipping costs to send to Hawaii. Hawaii also doesn't qualify for free shippng, either (JoAnn's). It's cheaper for her to mail the yarn Priority Mail with confirmation number after making the purchases. I do have a list of Hawaii friendly companies to order from, but I'm not familiar with the yarns.
The other reason is I am a very picky person when it comes to texture when I am knitting, so I won't buy something I don't know is soft & easy to work with. Cuz knows what I like in yarn and as long as I have a specific list, will get what I need/she can find. She is already gearing up to use the HL coupons.
My family is going to be getting a knitting package together for me as my Christmas gift, so I need to figure out what to tell them as well.