I would like to also recommend looking at the for-sale section of the forum as well as looking at the forum sponsors. Postwar steamers are fantastic and will run for forever, I am a fan of the 2025 and 2056.
One forum sponsor, Trainworld, is running a special for WBB 4-6-0 for ~$150, they were set breakups. I do know that it is above your stated $100 but considering these are new, I thought you might be interested.
Williams #WIL1235 New York Central 4-6-0 Steam Engine #1235 With Whistle, Bell & Smoke (trainworld.com)
Williams #WIL1322 Union Pacific 4-6-0 Steam Engine #1322 With Whistle, Bell & Smoke NO BOX (trainworld.com)
The video below is from Trainworld and shows off the above
Bryce