I found one place and it only has one song, "I've seen hell". It says it's transcribed, so I don't know how accurate it will be, but it looks like its free. link
Well there are numerous online musical stores that deal with sheet music. Usually it depends on the individual to choose the best one that offers some discounts and give wewe a quality work. I made my collection of kinanda and guitar, gitaa muziki sheets from MusicForte website which has some great varieties of songs and offers an incredible range of CD’s and DVD’S of your inayopendelewa artist with great discounts as well. Pay them a visit and wewe are bound to find what wewe are looking for.