Ilford's Prestige smooth Hi-gloss has several matches.
Pictorico Pro Hi-Gloss white film and Oriental Graphica Hi-Gloss white film has one at 50% less cost then the other two.
Just checked the price and there is way more difference then I thought.
Pictorico 20 sheets 13x19 - $79.99
Graphica 20 sheets 13x19 - $17.20
Print with a dye ink on these films and it has that pure Cibachrome look.