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Any sort of electrical heating (short of a heatpump*) is going to have similar costs.
If it's at all possible to install an extra radiator it's going to be the only sensible option if you care about long term costs.
(* There are a few models of portable air conditioner that can work as a heatpump for heating. No idea how rubbish they are.)
No, true. We have a two foot one for keeping our guinea pigs warm and that's obviously quite a bit cheaper.