That was a cheap one.... A lot are 6-700 and more if there's no aftermarket source.
For my own part I usually use NH discs in any of my own stuff. For lighter use or backyard type stuff I often use a Hy-Cap reman. I just find the Luk discs NH supplies are a bit better over the long haul.
As far as prices compared to Deere... I find NH is much the same. Some things are reasonable. Some things are outrageous... and a lot of stuff is just plain expensive.