Keep in mind this info is a bit over a year out of date but I got a 2.2kW water cooled spindle and VFD from Chai for £216 ex VAT. There were places that were a little cheaper but as I was getting other parts from Chai it made sense to get them all together. I also found a load of suppliers on ebay that I wouldn't touch with a barge pole, YMMV, worth a google pre-purchase though.