Question 1: Many are using the Hydor Inline heaters, They are sold by most reputable online aquarium dealers. Pick one that has a good rating report if your that worried.
Question 2: Cheapest isn't always the best, I use Mulberry Farms, fast, quality feeders and the price is good. There are many places to get feeders and everyones favorite place seams to be different. That is kinda a personal preference.
Question 3: Steam cleaning is an excellect way to deep clean your cage/decor without the use of harsh chemicals. The units can be pricey, yet it's more of an investment in your chams health....actually if you use it in the whole house your health aswell! There are alot of members trying the new aray of UV wands that kill bacteria and germs. Not sure exactly where to get the best steam cleaner but they have the wands on Amazon and even at Petsmart. Try the search feature to get more info.