I'm not up to date on prices for some of these but let's see what I can think of from memory lol.
I've been able to buy a lot of the sets of minis at roughly $2 - 3 per pony. But it does vary depending on sets and I don't have all the ones you have listed yet.
I think I just got the AJ Equestria Girl you have there for $5 unopposed. But that may be because she had $8 listed for shipping and I went for her with a combined shipping rate that made her about $10 total.
I believe the two TRU favorites collection hit about $80 - $120 for the Nightmare Moon one and $100 - $150 for the Chrysalis one.
Fluttershy's Nursery, Rainbow Dash's Camping set I think, CMC School Pals $25 - $35
Wedding Castle I think $40 - $60
Bridle Friends sets $10 - $15 each
Wedding CMCs maybe $10 - $20
Cherry Berry $5 - 10
Trixie $15 - 20
Any set here Mane 6 on backcard probably about $5
Coloratura, Skywishes and Sweetie Drops on card about $10 - $15
Mane six original/travel series $5 - $10
Non-mane 6 for original/travel series is $30+ depending on character up to $60 though.
Twinkleshine, Lily Blossom, Cupcake and Dewdrop Dazzle I believe tend to be on the lower end with Blossomforth, Flitterheart, Honeybuzz, Plumsweet, and Feathermay on the higher side. Cherry Pie and Lulu Luck somewhere in the middle. I would definitely double check that though it's been awhile on those ones.
International Rarity's Carriage with Star Swirl they tend to not sell at ebay prices. I was unopposed on mine for $75 but there was a typo in the listing so up to $150 probably?
Rainbow Shimmer Celestia $10
Rainbow Shimmer Luna $15
Target Celestia and Luna I think about $25 - 30
Zecora $30
Photo Finish and Shadowbolt Dash $10
Crystal Empire Luna/Rarity $45
Crystal Empire Celestia/Pinkie $25
Sunset Shimmer $10 - 15
I thiiiiiink that's all I've got for now
Please do give me a nudge if you end up selling. I'm dying to get a hold of that Cheerilee Picnic set and I see a few others in there as well that I'm looking for.