After the alternate gotek drive emulator firmware allowed it to be used on an Amiga, I wondered if a similar thing could be done for cheap internet access.
The firmware in this would probably not be very useful.
http://www.ebay.co.uk/itm/Serial-TTL-RS232-to-802-11-b-g-n-Converter-Embedded-WiFi-Module-CE-FCC-l-/281138524113 However it appears to be running Linux
User Application SWSupport customized apllication SW with Linux systerm.、
In which case it might be possible to reconfigure/reflash it to provide a PPP connection. You can configure the wireless using AT commands, so that would need a dedicated Amiga application but the actual internet connections should be doable using MiamiDX (or any other TCP/IP stack that supported PPP).
Running it over RS232 (especially paula) would obviously be slower than using PCMCIA/Zorro/PCI etc. But the last time I had an Amiga online it was using a modem, so I'm not particularly worried. Plus it would be reusable on any classic computer, Atari ST, c64 (just add serial port) etc.
I'm not going to look into this any further for a while, so if someone else fancies a challenge then it could be a cheap hack.