There are several options and you can order direct.
Seems over the years that car covers have gotten very expensive. When I purchased my C5 cover, the cover I wanted was $300. I found it here on the forum like new for $150.
On my 2 C4's I have Wolf Covers and another brand. On my LT1 C4 I got a WOLF used on this forum for like $35. I also have a lightweight cover that I put on top of the wolf simply for the fact that I have it.
On my ZR-1, I bought a Wolf new for like $150. That was 10 years ago.
I guess I'm cheap but seems to me that a cover should be 100-150.
Just do some googling. This place has free delivery but there prices might be high - you have to do your research etc.
You get what you pay for in a car cover. However, when you park your Corvette in the garage, I think some of the covers are overkill. My wolfs have treated me well.
Just make sure to indicate the cover is for a ZR-1 as a regular cover is a bitch to get on