Craig Shaw Gardner is funny. But these are not available as eBooks. But still worth the read in paperback.
1. A Malady of Magics (1985)
2. A Multitude of Monsters (1986)
3. A Night in the Netherhells (1987)
1. A Difficulty with Dwarves (1987)
2. An Excess of Enchantments (1988)
3. A Disagreement with Death (1989)
1. Slaves of the Volcano God (1989)
2. Bride of the Slime Monster (1990)
3. Revenge of the Fluffy Bunnies (1990)
1. The Other Sinbad (1991)
2. A Bad Day for Ali Baba (1991)
3. Scheherazade's Night Out (1992)
4. The Last Arabian Night (1993)
Also, I highly second the Discworld series by Terry Pratchett. Last night I finished the 15th book Lords and Ladies and was finding lots of groans and laugh-out-louds. The series is definitely going to make you groan and laugh.