M.A.
My suggestion is not exactly cheap, but well worth the money. You need to get a My Tot Clock. http://www.mytotclock.com/home.php Look over the website. It is a really neat clock that you can set and it will show your toddler whoch color means they need to be sleeping, which one means they can get out of bed, play songs when they are supposed to wake up. It will help your toddler understand naptime/bedtime and help them be more responsible.
It has so many uses. Timeout timer, alarm clock, and my favorite, the encouragement timer. You could even use it for a slow eater to tell them that they have x amount of minutes to eat and then the clock will change colors and their food will go away. You have got to get one. It makes for a great birthday gift for a 2 year old in my opinion. This clock can be used for a long time, until they can tell time on their own, it even has great use after that as just a plain alarm clock!