First up is The Fursuit Maker Database
Overall it is a great site, it tells you not only a huge number of fursuit makers, reviews on some, links to their own sites and whether they are currently taking commissions.
Next up is the Makers Database
Which focus more on how to choose the right fursuit, with reviews and photos of completed works.
Both sites are excellent and get my highest recommendation.
On Sobadsogood.com they talk about a very realist sloth suit. You judge for yourself.