If you're looking for a replacement cushion for your classic Saarinen or Burke Tulip chair, be prepared to shell out $327 apiece! Ouch!
One option is to simply dress up your existing Tulip chair cushions with a TULIP TOPPER cushion cover by Walbea.
Made of premium Tuscany velour, they have a plush look and soft feel to compliment your classic Tulip chair, plus they feature high-strength elastic so you'll get a snug/wrinkle-free fit.
At only $29 for the Tulip side chair and $39 for the armchair version, this is a great alternative.
Simply google 'Tulip chair cushion cover' and you'll find them.
They are available in a medley of far out colors.
BTW, Walbea makes Tulip chair seat cushions as well.