Those handles are the old 1,000v high-voltage (or insulated) handle design. Channellock's website currently shows insulated handle pliers with red and yellow handles instead of blue, but they are hard to find for sale anywhere, so I don't know if they ever caught on or if they are still being made/sold. Models like 318i, 337i, 348i, and 437i.
If I remember correctly, the older style blue handled ones you are looking for have been out of production for 4-5 years. Look for Channellock models 3218, 3238, and 3248 if you want to keep an eye out for them. They do pop up on Ebay from time to time. I think they only sold 3-4 models with the blue insulated handles, so there aren't many you have to find if you want to collect them all.