In need of an imobilliser fob for my 2001 v40 does anyone have one for sale? not too expensive if poss.

HI! 1st post so hear goes! bought my v40 2001 1.8i over a month ago now, would like to re activate keyless entry but unsure as to wich fob I need if I was to buy one 2nd hand ebay etc.
Did speak to volvo dealer and is £30+vat to re-program, so any suggestions appreciated thankyou