Flexible, flat - and adhesive - connectors for PCB pin pads?
I am not sure if I understand you correctly. You do not state if what you are looking for should be very cheap (i.e. packaged with every product) or for your own testing.
If it is for your own testing you might want to look at Tag-connect cables. With these you can program/interface with round pads while having no connector mounted on your pcb.