I purchased a Barclay fireclay sink for $772.00 from a local plumbing supply co.
30"x18" 10"deep.

I would generally say, no. Occasionally you can find something on Ebay, but you also have to calculate in the shipping costs, which for a fireclay sink is going to be high. I got a Shaw 30x18x10 and I paid about $625, which is HUGE bargain for that sink. That said, I would buy it over and over again. It is truly a joy to use, keep clean, look at, etc. I built my entire kitchen around that sink and my soapstone tops, so it was a non-negotiable item. I cut back in other areas to be able to afford those 2 key things (got some butcher block counters, and did IKEA cabinet boxes).

I purchased my Whitehaus Farm sink from Blue Bath. The sink was $655 with free shipping. I haven't used it yet because the cabinets are being installed as we speak but it is gorgeous. It is the WHA582, which has a decorative front, so not the plain jane base style. It shipped quickly too. If you are looking for something a little smaller or just a plain front, you may be able to get it within your budget. Also check ebay sites, sometimes there are good deals, sometimes the same places that have websites are actually selling for more $ on ebay, so check out all the options.

Ikea sells a 24" single and a 36" double bowl farm style OVERMOUNT sink called the Domsjo. Their site is being petulant and not showing it currently as it is want to do, but if you google around or search this site you should be able to find it. It's likely $200-$400 but I can't find the exact price right now again because Ikea's website is kind of awful. It's a nice cheap version of the more expensive undermount farmhouse sinks, we put one in my brother's house and he's very happy with it.

I have had great luck with hometodreamhome on Google. I picked up a discontinued farm sink for only $450 and that included shipping. It was 36" wide if I remember correctly as i have since moved from this home that it was installed. Great deal though.

Be sure wherever you get it from has a good return and replace (or refund) policy. There have been several instances over the last few years where fireclay sinks have arrived damaged. IIRC, everyone was eventually able to get an undamaged one, but I think it took a couple of people multiple sinks. As long as whatever site you use handles this well, you should be OK.

Check each site's reviews very carefully. In particular, look for reviews from people who received damaged goods....then, see how they feel about how the site handled it.

Depends on the size.

For a smaller sink, if you're anywhere near an IKEA, the Domsjo is a good choice (it's around $250), comes in single or double bowl, and can be undermounted.

For more traditionally styled apron fronts, the best price I found was from Vintage Tub and Bath (www.vintagetub.com). Depending on the size of the sink, they run from $400 and up, with free shipping.

I have a SS single bowl apron front. You didn't indicate whether you have ruled out the SS, but I can tell you that my 36" single bowl is awesome! It was around $600 on eBay, 16 gauge SS. It is quite deep, 10" deep and will swallow up a big pot so company can't see it :)

I too was going to suggest a stainless steel apron front sink if you want to spend less. Even at 16 gauge (which is a better, thicker gauge than the more typical 18 gauge), stainless will be less expensive than fireclay. Also, fireclay sinks can sometimes be difficult to install--they are handmade and therefore sometimes their dimensions are slightly irregular, which adds difficulty to scribing the counters around them. Also, some have reported that with a fireclay sink, if you aren't careful when installing a disposal, and overtighten, you could get hairline cracks around the drain. Having said all that, fireclay apron front sinks are beautiful and have a unique look.

I think Firsthouse's stainless sink shown above is beautiful. I will also link Hobokenkitchen's kitchen. She bought her stainless apron front sink as a no-name on eBay, and said she was very pleased with it. You can also check overstock.com which has several lovely Kraus 16-gauge stainless apron front sinks (they call it a "farmhouse sink"). Another source is Galaxytoolsupply. Galaxy Tool Supply also sells on eBay at a lower cost--they often have a "Make an Offer" option on their ebay listings, and will accept reasonable offers.

Here is a link that might be useful: Hobokenkitchen's Finished Kitchen Thread