Price of Algae Centrifuge

Many companies in the algae fuel industry are experimenting with using centrifugation for harvesting microalgae. I'd like to have reliable cost estimates for centrifuges for large-scale processing - say about 1 million gallons per hour and more. I tried the Alfa Laval site but was not able to get any price quotations. Are there any companies that have provided indicative price quotes for large scale centrifuges suitables to separate microalgae from water?