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jasonjs

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Even before the more polished products existed, people have hacked together external GPU enclosures, often interfaced to the host's PCIe bus via ExpressCard slots or ribbon cables hanging off of Mini PCIe slots. And more recently, with the interest in cramming many dual-slot GPUs onto a single motherboard for cryptomining rigs, you can find cheap, "barebones stand-alone PCIe slots" (for lack of a better term) for hanging GPUs off of. A quick search turned up a couple of examples:

https://www.aliexpress.com/item/Mini-PCI-E-to-PCI-E-1X-Expan...

https://www.aliexpress.com/item/60CM-PCI-Express-1X-To-16X-P... (Ingeniously, on this one, they've re-purposed USB 3.0 cables to carry the high-speed PCIe lanes).

These radios have been available for quite some time, it's the Semtech SX127x line (e.g. SX1276). I was looking into LoRa and other long-range IoT WAN radios about a year ago for a research project.

You can get cheap (22 USD) Arduino-compatible development boards here using HopeRF modules, which work great with the RadioHead library:

http://www.anarduino.com/miniwireless/ http://www.airspayce.com/mikem/arduino/RadioHead/

(I have no affiliation with the websites.)