Those prices dont seem to bad. It would take me about that much to make one plus a big mess.
What size would your recomend. I see you can make a couple of different weights with foam inserts or lead.
My deadlift max is around 375. Squat to ground is about 250.
The keg or other object would be very easy for me, but I want to leave in my backyard playground area, and I dont think I could pull off the keg in the back yard without getting slapped by my wife.