The same company (Warner Music Group - X5 Music Group) has released a lot of others, all download-only, for $7.99. X5 is the company that releases those really cheap classical sets ("The 99 Most Essential Saint-Saens Masterpieces," etc.), which, no surprise, sell really well because of their low prices. I guess they've convinced Warner Music Group to lease some of their older releases through them. Smart move. Here are some others I've found:
Al Jarreau - Complete Reprise and Warner Albums
Firefall - Complete Atlantic Albums
The Spinners - Complete Albums 1973 - 1984
The Trammps - Complete Albums 1976 - 1980
Atlantic Starr - Complete Warner and Reprise Albums
Nicolette Larson - Complete Warner Albums
And there are others...I refused to list David Gates - The Complete Elektra Albums, for example. Even I have limits.