PL14s at 20 yards (you can get cheaper ones with only the inner 7 or so rings known as PL14/06) or SPA1 or PL19 at 25 metres.
I've seen targets positioned anywhere from about 1 foot off the ground to about 5 feet. Centre of target at shoulder height is good. We are flexible.
Could probably send you some targets if you reimburse my club.