If you are looking for the traditional ugg like boots, there are a couple of vegan options. Pictured above is an offering from Alternative Outfitters that are made with microsuede uppers and fully lined with a comfortable soft faux fur.
$48.00 at Alternative Outfitters
From Amazon, another vegan friendly offering , made from man made materials, fake suede and lined with a warm faux sheekskin.
$29.99 at Amazon