PCR primers have become so cheap we had a discussion in the lab today about whether we should simply reorder, rather than try to find some old ones that weren't where we thought they were! This rather glib suggestion made me think about how long I should look before giving up and simply reordering.
At around £0.10 to £0.25 pence per base a pair of PCR primers will set you back £5-10. A post-doc salary is about £16 per hour based on the average salary of about £30,000 per year. So if you can't find your primers in about twenty minutes, give up, place a new order and wait till they arrive.