Web site: 5750DX Digital Electronic Flash
Key Features: tilt/swivel reflector with manual zoom, second flash reflector, modular system
Reasons to Buy: Cheapest option with a secondary reflector.
Notable Drawbacks: Manual zoom only. No advanced features.
The secondary reflector on this is far less powerful than that on the Metz flashes, but is still interesting. Even when you add in the cost of the required 5050DXR/PX module, this is the cheapest you'll find that feature. The interface is designed for manual control, even including a mechanical calculator for flash power. This is somewhat unique for the flashes in this guide — generally they are newer models designed primarily for automatic control, with manual flash as an afterthought (if available at all).
More about the Promaster 5750DX can be found on these pages:
Including an Amazon link on this page is the easiest way to display the current prices, without having to keep track of it manually or write a more-complicated tracking script. And as a bonus, there's a picture of the flash. Obviously, the ad is also an affiliate link. As with all advertising on this site, I hope it's not too obnoxious.