I've got the December 1990 issue of MacUser to my left. In the introductory article for the IIsi, LC, and Classic, there's a table of the "New Mac Family"

The following prices and configurations are listed for the SE/30:

$3,869: 1 MB, SuperDrive

$4,369: 1 MB, 40 MB

$5,569: 4 MB, 80 MB

(As an aside, there's also an article on hard drives. The cheapest model, in terms of cost per Megabyte, is the MacProducts Magic 380 at about $4.20 per meg)