cmv,
apparently onvia.com set's a different price for every shipment of drives they get. If they don't have the IBM 30gb 75gxp drive in stock, i'd be very surprised because when they say "in stock" well, at least for my last 20 or so orders, they really will have it in stock.
My roomate has an IBM 75gxp 30 gb drive but for some reason his drive is more quiet than mine. I bought the 75gxp when it first came out and my roomate just recently bought his. Both were from buy.com