1) Springs are not that expensive, BUY THE CORRECT ONES FOR THE DROP YOU WANT.
2) If you drop more than 1.5" your are going to need to buy a lot more than just springs. If you cut corners on this someday you will make a post with a thread title like this; "I was driving in the rain/snow/loose gravel and my car just suddenly spun into the ditch and was destroyed"
anything more than a 1.5 drop you will require more than just the cut springs you will need the bump steer kit, LCA's and a few others things plus they are different spring rate for a 1.75" drop