One of the outcomes of the Electrolux executives' buyout from Sara Lee in October 1987 was the creation of different sales lines besides the customary direct sales (door-to-door). I am aware of the Warehouse Club Line, the Department Store Line, the Catalog line, and the Trade Show line. Some were also sold through QVC such as the 80th anniversary Ultralux C152E tank.
This is not to say that model names were exclusively sold through certain lines; as some were sold directly and indirectly.
The cleaners featured in the SM catalog photo above are the Special Edition series Model 1623 non-automatic tank with Model 7B power nozzle and the Model 1572E upright. The Special Edition series was also sold via the Trade Show line (e.g. state fairs). Manufacturing took place from c.1988 to c.1992. Other Special Edition cleaners were the Model 2100 automatic tank & the Model 2101A shampooer/polisher.
When Sara Lee bought back Electrolux in 1990 it continued the indirect sales lines— much to the chagrin of the direct sales force, who had to sometimes attempt to awkwardly explain to upset customers why Electrolux cleaners in stores were priced much lower than what they had paid; and who lost commission. Aerus Concepts seems to have discontinued the indirect lines.
Other indirect model names have been: Regency Series (two successive automatic tanks, one non-automatic tank, an upright, and a shampooer/polisher), AmbassadorSeries (non-automatic tank & upright), Lux5500 tank, Prolux 'Commercial' upright, Prolux 2000 upright, 2100 tank, Lux 2000 tank, Ultralux 2000 tank, Xtreme upright & Xtreme Plus upright (with attached hose).
Other stores that carried Electrolux Corporation/LLC cleaners were: Best Products, Montgomery Ward, & Sam's Club.