Welcome: You might wish to search the site (upper right hand corner of your screen) for “dip belt” and you will find straight up several threads treating types and price ranges. It is a good idea to use this approach first for all questions.
I did the same.I got a weight belt at Wal-Mart and the 4 foot chain and D-clips at Home Depot.Works fine. I guess I could have ordered one but I was excited about switching to weighted dips so I wanted the gear for the next morning.
You may want to think about abandoning the dip belt idea altogether and getting a tree climbing belt. These are the harnesses that lumberjacks and linemen use to scale trees and the like. I’ve never used one but I hear that they are far more comfortable than traditional dip belts. Poliquin talked about these in his last Question of Strength (April).
“These things can run up to 300 bucks, but I’ve bought them off of eBay for as little as ninety-nine cents. With a tree-climbing belt the weight is equally distributed, and they’re much sturdier than a dipping belt. You can add 250 pounds to it and not feel any pressure on your hips.”