User blog comment:HatsuneMikuFan3939/Vocaloid/@comment-24840832-20140611070604

My advice would be the "Songs featuring [VOCALOID]" (category) pages.

Other than that:

SeeU: "Hide and Seek", "Alone", "Poem of a Thousand Years", "Shining Star"

Luo Tianyi: "Flower of War", "China Ink Girl", "China Candlelight Girl", I personally quite like "Ramesses" (featuring Len), "Half and Half", "Singing for Yayin Gongyu", "Reminescence of the Red Lotus"

YANHE: "Rain of Dreams" (I've gotta listen to YANHE more)

Both: "Cicadas under the Moon", "Puppet Master-Finest creation"

MIRIAM: "Secret Space", "Eulogy for Abel", "Samsara" (though I like the other two songs more)

I don't really listen to LEON and LOLA much, I'll have to admit. If you wanna hear them, though, I suppose you could try "Memory" by Circus-P. And it's really easy to find decent covers using them. Oh, and "Existence" for LOLA.

Sweet ANN: "Through the Night" (featuring her together with Luka) I don't know enough Sweet ANN songs

Sweet ANN, BIG AL: "Headline Love"

BIG AL: "Blues", "HIM" (I don't really listen to him all that much either, earlier Engloids, dammit). But the "Stray" cover by Giuseppe is really good!

Tonio: "Solowing", I suppose, and it's not an original but his demo sounds pretty neat, too

"Please Excuse Me" (BIG AL, Tonio, Luka)

Prima: "Call me Captain". I wanted to listen to "One & One" but there don't seem to be any youtube videos available anymore. But it's by Shu-tP, so if you can find it or watch it on NND, it's probably going to be good.

SONiKA: "Fade Away"...um..."AiSeNMa", maybe? (I'm not too much a fan of Circus-P's music style, but that song is pretty decent and your opinion may be different)

AVANNA: "Rose+Thorn" (featuring LEON), "Silence" (It feels weird that I can't spontaneously name any more, given how many she actually has already). Whelp, it's only partially VOCALOID but should still count: Listen to "Sad Machine" if you haven't, yet. "Creative" (featuring KAITO). AVANNA is a good time to mention that AkiGlancy has really great songs, including English ones (some on this list are from her).

OLIVER: *coughIdon'treallylistentoOLIVERcough* "Tarantula"? "Pumpkin March", "Lavender Town Syndrome" (not featuring SONiKA but also a SONiKA song)

YOHIOloid: "NeapolitaN", "Knot or Not" (the original was by Miku (feat. Rin, I think) but this version is by the author herself) Please note that both these songs are mostly in Japanese with a bit of English. Even less English and more Japanese (but it's a really good song) in ORANGE LINE. I don't know any purely English only YOHIOloid originals, but there are plenty of covers.

OLIVER and YOHIOloid: "Dance with the Dead" (there's probably more but meh)

Clara: "SISTEMA RECARGADO", "Más que Nada"

Bruno: "Un Solo Corazón"

Bruno and Clara: "¿Quieres ser mi novia?"

MAIKA: "En tu Mirar", "Waves of Change", "Que decida el corazón"

Why, yes, I know that most of the Spanish ones are from the same producer, I could've added MORE. Also perhaps take a look here

Dot dot dot...I don't think I forgot any VOCALOIDs. There are of course far more than this that I either don't know or can't think of right now and there are songs in other languages featuring Japanese VOCALOIDs.

As for the second part: Duh. Of course you can buy VOCALOIDs. How do you think people get them to make songs with them? That's the point of a commercially sold product. I wouldn't know any places in Singapore but depending on what VOCALOID you'd like, there are different options: The companies pages (Voctrolabs, for instance, or PowerFX. It seemed a little more complicated with Zero-G), the VOCALOID store, some are available on amazon or eBay. This should help, too. Next time look a little more carefully, that link was right on the front page.