By no budget do you mean that you don't have much money? The least expensive you'll find a projector is in the $500 range generally. The only way to get one for less than that is
A. go used, but this is risky for several reasons. In particular if the bulb is shot that can be several hundred dollars to replace.
B. build your own projector. Simple & small models based on a 3-4" LCD can be built for around $100-150. I'm building one based on a 15" LCD, with 1024x768 res for less than $300. You have to have some techie skills to go this route though, it's not for everyone.