Good sweet wines (or something like it)

[littlelizzy04]

Hi!
I am new to wines, and haven't decided whether I like white or red. I can guess that I would like white, as I am a wuss and don't like tart or "sour" things (as rudimentary as "sour" would seem to describe wine) I have heard that German wines are very sweet (something about a Riesling grape...) and that Italian Lambrusco is a good thing. I would like to get something good but not too expensive ($15-$20) Also, I live in Iowa, so local wines and wineries are out of the question (I have heard bad things about the wine here, and with the extremes in temperature, I can see why.) I guess the bottom line is I'm looking for something sweet for cheap I can find at the local liquor store or (gasp!!) grocery store.

Thanks so much!