For sure theres renderfarms out there, some big ones too. They used to do bryce, dunno how thats goin right now though... bryce did almost drop off the planet durin the B5 age... 
However... another thing u might wanna concider is ur gunna feel it in ur wallet if u go to a renderfarm. I remember a while ago prices were about $0.30 per gigaherz, per hour. so lets do the math:

$0.301ghz24hours = $7.20 which isnt much, but half a day for a home render pc so not really interestin to send to a renderfarm...

$0.301gh336 = $100,8.... lotsa cash, for 1 pc rendering only 1 week... still something u could better render at home.

4 weeks? $403,2... etc. etc. 

ouch!

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