I got mine from faucet.com and it is a double bowl kohler white cast iron farmhouse sink. My bowls are equal size though.
Product/Description Quantity
K65344UWH
They price matched Home Depot online for this sink and with shipping my cost was $1130.50. I LOVE my sink! Good luck!

Mine is a Rohl/Shaw's. I was able to persuade a local place to sell me the showroom floor sample for $500 but I think it usually costs $800. It is a single bowl, off-white fireclay (only comes in white or off-white). I shopped quite a bit but never saw a 2 bowl sink with unequally divided bowls -- they are either one bowl or two equal bowls. I like the Shaw's better than Kohler because it has much thicker walls -- a heftier, more substantial feel -- but that is personal preference. The Kohler models might be found through HD in the $800 range depending on size. The Shaw's factory is backordered through April. Other brands are more expensive.

I bought a Whitehaus fireclay sink from Bluebath.com (an ebay storefront, if you search Whitehaus on ebay you'll find it). It is 35" wide outside dimensions with an 8" bowl (I have the garburetor on this side) and a 24" bowl. I paid under $600 for it. I love it, but must say I have had it installed less than a week. Well after I bought it I read of some instances (one or two) on GW of people who had problems with cracking in Whitehaus sinks, perhaps due to thermal shock. I haven't experienced that, and I have an insta-hot on this sink which pours near boiling water on to it. Let's hope I never do. Prior to buying the sink, I had read a lot of rave reviews here for it. Blue Bath was fast and courteous and (at the time I ordered at least, last summer) had a 100% feedback rating on ebay. I can fit my largest pans fully in the large bowl, and with my gooseneck faucet, I can put my kitchen trash bin in upright to rinse it out. Fabulous. Also, in the past few days I have not been precious with using it, and notice no dings or scratches (so far). Also, FWIW, I went with fireclay not just for its looks but in part b/c my friends in New Orleans who had fireclay sinks in their homes there had their fireclay sinks survive Katrina even when the rest of their kitchens/homes had to be gutted.

I bought 2 farmhouse sinks, both from Shaw. One is a very large 36 inch single compartment for the skullery and the other is the 23 inch single compartment prep sink in another part of kitchen. They are white fireclay, beautiful, heavy. I love them.

I just ordered a Whitehaus 5020 from faucetdepot.com.

They had the best price I could find and shipping was reasonable. Ordered my disposals from them at the same time since their prices were the best on those items too (and free shipping).

I got my Shaw's 36" single bowl fireclay sink through Ferguson Enterprises. They are a distributor for Rohl. Ferguson has showrooms all over the country. I ordered through them and they delivered to my home. They are distributors for a lot of brands.

I got my faucet through them, too, but that company went out of business!?

Whitehaus Quatro from Quality Bath; excellent service, best price, WONDERFUL sink! They're having a special on Fireclay sinks now  have fun!

Here is a link that might be useful: Quality Bath farmhouse sinks