I just found a few kits on amazon. Not too pricey (about $3 door) and good reviews. I'm going to give them a try!

Blum hardware on our IKEA cabinets have soft-close hinges. They are, indeed, awesome.

We just toured a house last night that had soft close cabinets and drawers in the kitchen. Wow! Wow, these things are awesome! It looks like they have something in the hinges that slow down the last few centimeters of closing. I wondered if anyone here has found a kit or a way to retrofit cabinets for this?