Rent a Business Projector from Projector123
If your budget won't accommodate a pricey business projector but you need one for the occasional presentation, here's a solution: Rent a projector from Projector123.
The service offers 2000- and 3000-lumen models (the latter suitable for ultra-bright environments, like rooms with lots of ambient light) for periods of one day, two days, or a week. (The rental period actually begins the day before you plan to use the projector and ends the day after, thus giving you time to receive it and ship it back.) Prices start at $99 for a one-day rental, not including $30 for round-trip Fedex shipping.
It's worth noting that you can pick up a lower-end projector for as little as $400 (Buy.com, for instance, has a ViewSonic model on sale for $399.99 after rebate), so using a service like Projector123 doesn't make much sense if you do a lot of presentations. On the other hand, it could come in very handy if your projector accidentally gets left behind when you leave on a business trip, or gets broken along the way.