I bought these at the PSA Conference years ago thinking older DD would use them, but she didn't, so there they sit in the box. PM me or reply here if you are interested.
I got a great deal on CorAces for my DD's, planning to use them on new boots for one DD and replace the blades on the other DD's boots. The second DD outgrew the skates before I could have the blades mounted. (I think she grew over one long weekend - one week they were fine, the next week she was miserable in the skates.)
Her new boots (of course) needed a longer blade. Our pro shop took them in exchange since they were in perfect condition, never used. It was a size that they could sell to someone else, so they ordered the right size for my DD's boots, no charge.
Might be worth asking about since you refer so many people to one pro shop for blades. Maybe your blade guy can help you out.