Hmm yeah, I see what you mean. From a fan's perspective, it's very understandable! Not to this degree, but it happens to me too sometimes with artists that I like but haven't produced a lot of stuff. I always want new things lol. In these cases, I look for bootlegs and/or live recordings. Some artists are very creative in their live performances and can make the same songs that you know sound like totally new.
Ah so you discovered them thanks to Kill Bill. Well I had no idea this song was featured there, can you imagine. I knew the movie, but never saw it, so I didn't know. I knew Goodnight Moon from many years before (now that I think about it, not too long after it was released!). I bought "I Oughtta Give You A Shot..." a couple of years later, and also the single of Goodnight Moon. The funny thing is, I hadn't listened to Shivaree for a really long time, nearly had forgotten about them! Then all of a sudden I remembered them and to my frustration I found out I had lost the GM single
I have no idea where the hell it disappeared into
But the best part is, when I remembered about them, I soon came across the news that Ambrosia was releasing solo stuff! Now wasn't that a wicked co-incidence!