You can always design one yourself. Analogue Devices offers many chips that are SDRs-on-a-wafer. The AD9361 is a particularly popular chip.
I am suggesting a nicely made, high quality, plastic case - with buttons and screen - that has slots and mounting screws inside to insert a raspi zero and a USB dongle inside.
I quite like the standard handheld radio form factor - like this:
https://www.motorolasolutions.com/en_us/products/two-way-rad...
... I just want a linux computer and an RTL-SDR inside ...