I haven't tried....lol
it really depends? MLP Fair has always had it's own exclusive (it used to be totally separate and different than the SDCC one).
What is "worth it" to me is totally different than for you :) I honestly wouldn't have bought it had it not been for the fact that I was actually at the fair and was able to for-sure secure it for myself. I also told myself that when I finally get to go to the fair (and any other times I get to go) I'd for sure get the exclusive figure no matter what it was.
I do think she's super cool! I think for SDCC she's a great fit, based on the episode being a comic. She's also HUGE, so the price-point is (slightly) justified. Would I have been happier if it was a brushable, "art" pony (like they used to make)? Yes of course. But for the memory of getting her, and liking the episode she's in, it was worth it to me.
You might be able to get it after the con on the Hasbro website for price-tag. I think they had DJ on there for a while last year?