Moncler Jackets are worth buying given their feather down, and design.
Down jackets are so-called because they contain down, the fluffy feathers found in the undercoat of a duck or goose. Some cheaper down jackets also contain small feathers.
Eastern Mountain Sports, Eddie Bauer, REI and Cabelas sell men's down jackets. Each of these retailers also has an online store where you can purchase the jackets.
Unfortunately Columbia does not rate their jackets by warmth the way they do the sleeping bags, so there is no way to know.
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There are numerous retailers where one can purchase Down jackets for men online. They can be purchased online from 'Go Outdoor', 'Amazon' and 'Dick's Sporting Goods'.
Goose down jackets, coats, featherbeds.
Rab jackets would generally be worn in the fall and winter months. Rab jackets are primarily made for alpine skiing and other winter sports. They are usually down filled.
From looking at Google shopping, the price for women's down jackets ranges from around $150 - $300. There are a few exceptions to this price range, such as a $436 jacket from Altrec, but generally a down jacket costs around $200.
One can buy a rab down jacket from many different places. Most outdoor clothing stores such as REI offer these jackets for purchase. One may also look on eBay for the jackets.
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There are many retails outlets that stock men's down jackets such as any REI shop or Cotswold stores. You can get the well known North Face jackets at either of these stores as well as their own branded North Face store outlets. If online shopping is more you thing, big online sites such as Amazon and Ebay will have these for sale.