If you don't know my hometown pal Richard LeBlanc of New Big Dragon, let me help you with that right now. For me, he is the undisputed king of the d30 and also one of a handful of people that make their own products that are not only professional, but pleasurable to look at.
(Let me be clear: his PRODUCTS.) ;-)
If you love monsters and Old School D&D, he has a great deal going on right now on OBS sites: ONE crispy electronic dollar for his Creature Compendium. Grab it and enjoy just reading about new monsters or even better surprising your players.