well you have the usb like theses
and pci pci-e pxi interfaces cards too, sometimes they can be snatched at very low prices
some pcmcia cards too
or find some meters who can be controlled by usb / rs232 / lan, like the L4411A meter or any brand ...
Some L4411a can be purchased in the 500$ usd

or you need meters with scan cards Ie: more inputs ??
Keithley 2700 series
HP Agilent 34970
Siglent dmm, one series can have a scan card .....