Unblocked versions of used scanners are available all the time on eBay. You have to watch out for them. Usually, a scanner that can receive those frequencies is slightly older and would probably not have some of the features as newer scanners (trunk tracking, digital decode (APCO P25), dynamic memory allocation, close call feature, etc.).
As
pfish wrote, the frequencies blocked are in cellular band; but cellular is digital now (for the most part). There is not much to be heard on those frequencies anyway. I am not even sure why the government still bans the frequencies. I guess because it is still possible that if a cell phone cannot connect in digital that it will make the connection in analog.
There are Uniden, RadioShack/GRE, iCOM, and other scanners still out there that will pick up this band, you just need to keep an eye out for them. They are not illegal to own, just illegal to manufacture for sale in the USA that can be altered to receive those frequencies. Sometimes foreign versions, like this "Canadian Version"
iCOM R10 (covers 500 kHz to 1300 MHz) on eBay, receive the blocked bands. Also, see this "United Kindom"
AOR AR8000 (covers 500 KHz to 1900 MHz) scanner on eBay.
An example is the iCOM R1 (I have one). It receives from .1 MHz to 1300 MHz with no gaps. It is a very small handheld scanner. My iCOM W2A doesn't cover from .1 MHz to 1300 MHz, but it does get the unblocked band.