Cracked leaf spring! Help!

So, i just changed my rims and tires. My dad had an extra set from his old jeep and I was excited to save money and I like the look better. Rear passenger side top leaf is completly split and bent up. I bought it this way unfortunately. I did not know before purchasing as you couldn't see it from underneath. I am going to try and find a decent used one tomorrow and install with my dad (hes been in the automotive biz for 40+ years and im midly mechanical so it should be an easy driveway fix) So my question is what should I be looking at as far as cost for a used or new leaf spring and whats the approximate install time? Im 50 miles from home and stuck at my dads house until this is fixed. I have drive 5000+ miles with this issue since I purchased it last fall. Help Reddit!