They are a tad expensive but a rinehart 18:1 target is smalland would last decades if you just used fieldpoints on it. I believe they also have a smaller one now also, yes they do, and it is about a 1/3 the price of the 18:1:
RFT
10970
9" Diameter
The 9" Rinehart Field Target (RFT) is the ultimate go-anywhere practice partner. It weighs only a few pounds, is compact enough to fit in your suitcase " yet offers up plenty of different sized, vividly marked target zones to aim at from any angle. Take the RFT to your treestand for last minute practice, use it as a yardage marker, or simply toss it into the field for a instant shootout with friends. The versatile RFT is balanced with sand, so it always lands upright and ready for action. Grab the RFT"s convenient carrying handle and have a ball!
http://www.rinehart3-d.com/products/#i44