Help

Hey all, I have a 98 dakota with the 5.2l with 70,000 miles. Recently I noticed that all of my freeze plugs started leaking pretty significantly and I started to run hot. Any Ideas on what could cause this? I have replaced the thermostat, water pump, and radiator cap. Now the main issue is I got to get the freeze plugs fixed including the ones I between the motor and transmission bell housing…. I really don’t have a ton of money right now. Any ideas on what it’s going to cost me to get all the freeze plugs replaced? I live in NC Raleigh area. TIA