I'm getting to be more familiar with prices, but I still wouldn't consider myself an expert. I generally go by what I paid for items, or with lists on other people's sales sites (like
http://mlpstarmenagerie.ecrater.com/c/1297082/accessories)
With that caveat, here goes. These are also all considering that the accessories are in good condition and quoted in US dollars. If there's some damage, you'll have to knock the prices down
It seems like the invitation and "C'est le temps de feter" are the biliginual Canadian version, so I don't know the prices on those. Standard English ones would be about $2.00-$2.50 each
Birthday Pack accessories: party hats, blindfolds, Pink tails for pin-the-tail game, game itself $2-2.50 each. Party Panties box might be $3-4 in perfect condition.
The white moon comb and ducky comb are fairly common, so they might be $1 each.
If the frog brush is Steamer's (darker aqua) it's probably $8ish. If it's Ice Crystal's pale aqua one it will be more, but I'm not sure how much more.
The Megan and Ponywear nightgowns should be about $2 each.
I can't really tell from the photos if the shoes are definitely MLP. It seems like one might be Molly's white one (slightly wider with a "bow") and one might be Megan and Ponywear's Picnic in the park red one with a heart on it. They will probably be about $3 each.
I haven't really bought "normal" ribbons individually, so I don't really know about their prices, but the yellow one with gold trim looks to be a princess or sparkle pony ribbon, so it would be more, probably $6-7, but as I said, I'm less sure about ribbon prices.
Hope it helps
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