I'm no expert, but I should think that yellow, red, or orange a better choice than white, since to a whitetail, the color white means "warning/run/not good"; hence their flagging of their white tails when alarmed. Maybe buy a white one and die it orange or red? Then again, if it's snowy, the white will actually be camo for you. Sorry, dunno where to buy, but you're probably on the right track looking at outfitters who sell to northern hunters, who want the white as snow-camo. Good luck; they grow them big up there I hear.
Here's a start for ya - some orange & yellow ones there: