Being a little more specific about the songs:
eBay remains a fun battleground. I haven't managed to win any of the unreleased toys yet, though I keep trying -- currently the high bidder on one Diamond Tiara, see how long that lasts -- but I have picked up a Gilda and a Shining Armor, plus glitter Applejack and Fluttershy, Glow-in-the-Dark Twilight and Pinkie and Rarity, Breezie the Surprise lookalike, and Colgate and Trixie and Lyra. On track to add a Carrot Top, metallic Rarity and Applejack, Rainbow Flash, and maybe some princesses if I ever win one of those. All cheaper than (or within about 25 cents of) retail prices.