Well is July 2020, I found complete units for front $138 for both and rear shocks are cheap around $20 each, prices are all over the place for the fronts so do your research, I found anywhere from $65 each to $450 each! , I'm not spending lots of money for an old van.
A few months ago I seen a website that had a kit (2 rear shocks & 2 front struts) for $240. Forgot to bookmark the page, so I don't remember off hand. But I'll search it up again and happily share what I find.
Buy 2003 2003 Kia Sedona Front & Rear Complete Strut Assembly & Shock Absorber Kit 4 Piece Set - AM-3398918687 now at AM-AutoParts! Always Free Shipping. Order today by 4 P.M. EST and your order ships same day.
Well I just ordered them from RockAuto, got Monroe's for the front, theses vans are pretty heavy, about 4700lbs, after researching aftermarket cheapies and their issues of harsh ride decided to get brand name , rears are aftermarket mid grade, you would think free shipping but no, they are pretty heavy! total to my door $329, I tried Amazon but they want $168 each for same ones!