Dunno about the reliability of aftermarket block heaters, but
www.slhonda.com has an OEM for 1993 Accord various EX models for about $35 +
shipping/handling. Go to parts, put in your car's info, then select accessories,
then "accessories-electrical."

http://www.hondaautomotiveparts.com/home.htm also has them (also under
"accessories." Price is better but s/h may be more.

"monkey cow moon" <marbillionoil@spam.yahoo.ca> wrote
> wanted to buy: Honda block heater for a 1993 Accord EX-R.
>
> I can't seem to locate a genuine Honda block heater. My mechanic tells me
> that aftermarket block heaters may not fit properly and might pop out in
> extreme cold. Apparently in southern Ontario the aftermarket block heater
> might work but in northern Saskatchewan (where I'm headed this winter) the
> plug might pop out. Is this any truth to this?
>
> any help would be appreciated,
>
>