Princes auto had some last time I was there they seem to work as well as my old RCBS calipers from 35 years ago..but digital is a nice up grade
..when you buy calipers be sure to hold them up and make sure the jaws close nice and tight, no light seepage between them.
I tumble before I size my brass... keeps my dies from getting buggered up then I size and re tumble to remove the case lube if doing large batches, otherwise a quick wipe with a paper towel works just fine.
Lee makes a cheap shell holder that will fit in your 3/8" drill if you want super shiny brass, it and 0000 steel wool will do the trick.