You can of course buy it direct from Mackie ... but they will charge you shipping.
Also, if you need to change out the connector too, Mackie has the combined connector and tray all in one unit for a quick installation. They have it listed for $99 + shipping, whereas if you buy the separate tray and connector from BHPhotoVideo it looks like 39+49=88 with shipping included. That's a $20 difference for the extra hassle of installation of the separate connector. Maybe try calling BH to see if they can get the combined unit drop-shipped to you with free shipping?