It looks like Apple’s shipping estimates on its new Mac Pro have once again slipped with at least Apple’s US online store listing shipping availability as “5-6 weeks.” That puts the current delivery dates for the Mac Pro at sometime during May. Previously, Apple’s website was listing an available to ship date as “April.”

When the all-new Mac Pro finally went on sale back in December, it wasn’t long before shipping estimates for the new machine slipped to February on the same day, then March a month later, and until today Apple’s website listed an available for shipping date of “April” since early February.

Many of Apple’s other online stores in Europe are still listing availability as April, but dates in other countries, such as Canada, have also slipped to 5-6 weeks. While it might take you a month or two to get your hands on a new Mac Pro straight from Apple online, 9to5Toys has several models of the device ready to ship through various retailers.