[voltagex_]

I ended up using a reseller in Australia to get an "EE" SIM for an upcoming trip - feeling like I've been ripped off here as I paid significantly more than $10

Most of the prepaid SIMs I saw had heavy restrictions on tethering - can you point me in the right direction?

[nikon]

Are you travelling to the UK? There are loads of SIM cards for sale in arrivals, including EE.