If you are up for a bit of DIY try;
https://www.ebay.co.uk/sch/cnhomesupplies/m.html?_nkw=&_armrs=1&_ipg=&_from=They do cheap stuff that works. How long for Im not sure but my meter is happy. I have made a sleeping sack.
The most important thing with EHS is to turn off your electricity at night at the mains junction box 2 pole switches. If not you are surrounded by pulsed EMR and RF antennas when your body repairs itself. It does this at night because historically there was no radiation then. Simples.