If you are looking for a replacement that fits the traditional Spacemaker footprint (typically 24" to 30" wide), these current models at Best Buy are the most highly-rated equivalents:
A direct spiritual successor to the Spacemaker XL, this model features a two-speed 300-CFM venting system and simple convenience controls like "Add 30 Seconds". ge spacemaker microwave best buy
Price: $389.99 $248.99