Sine bars (not plates) are dead cheap. Unless you're making parts for the Hubble space telescope, you don't need gage blocks to use a sine bar effectively. Calculate the block height you need and turn a cylinder to that length on the lathe. A 0.001" error in the stack height will only cause a microscopic error in the angle.
If you know no math, the (free) SINEBAR program on my page will do all the math for you, including the effect of an error in the stack height.
0.1 degrees is still fairly small. 0.1 deg = 1.7 milliradians so, if you make that error shooting at a 100 yard target, you'll miss by only 6.28 inches.