Why would you assume that a $19 bottle of wine was supposed to be "a cheap bottle"? Did you think they mis-priced it?
Heck it wasn't even cheap on sale being >$10.
It couldn't have been the screw-top, because the time you found out it had a screw-top, you already knew that it wasn't "a cheap bottle".
I am not familiar with this wine, but I can tell you that you should no longer be surprised to find good wine in bottles using any variety of closure methods.
I have had top quality German wines sealed with crown caps - you know, like a beer bottle.
I think we will find '2nd New World' wines (from Oz, NZ and South Africa) leading the way in abandoning natural cork closures.