ERNIE BALL SLINKEY (REGULAR)!... well they are like $16-$20 depends on when and where you get them, but good enough
I use a GHS Bassics set that is probably 20 dollors or so if you are able to find them, they aren't terribly popular so I usually have to special order them. They last me anywhere from 6 months to several years, depending on the bass.
I paid around $19 for my D'Addario Slowounds (www.sheetmusicplus.com). Even, warm and consistent tone, not too bright, good feel. I like them. Why don't you try a set?