HackRf is even offering a Ham-it-up upconverter to go with, the same one you would use with a DVB-T dongle. This gets you into the lower range but uses a mechanical switch to engage. Would really like soft control of it and be more integrated into the design. I might even try to wire a relay in to a Ham-it-up along with a raspberry pi for a integrated device that can go below 30Mhz with IP based connection.
You'll also note the prices, and that those are receive-only devices. Some of the reason the price is so high is that we did all the RF design in-house, designing to our specs. A lot of the cheaper boards out there have less amplification, no (or too little) filtering, and use an integrated LO/mixer/digitizer/baseband chip, which limits them to the specs that chip can handle.