Super Being familiar with AliExpress and your images above I am surprised you haven’t seen all you are after. That is where I have seen and bought any of the ones I was interested in.
Super Unfortunately all my purchases where back in 2022 and Ali doesn’t have those records anymore. I did do a quick search on the regular Ali by just using Thomas trains or Thomas and friends and if you have patience looking through the results there are some but seems not as much as I once saw. I do remember have to research a lot with different search terms to find anything. We have discussed these knockoffs a lot here at BPT’s. I wasn’t much interested in trains per-say but I did pick up several layout pieces. You may want to look int this Brand…http://dumica.eu/dumica-brand.html A couple of my videos. all these bought off of Ali very cheaply https://forum.blueplastictracks.org/d/1559-fantastic-knock-off-bridge These Threads may help https://forum.blueplastictracks.org/d/1618-dumica-tomy-knockoff-comparison-review https://forum.blueplastictracks.org/d/3999-rare-red-suspension-bridgenot https://forum.blueplastictracks.org/d/4854-knockoffs-new-releases
MrKirby48 Superbuy, a proxy for 1688, TaoBao and Goofish may be an option. Not only for knock-off Trackmaster, but for other Thomas-knock-offs as well. However, take note that the shipping prices can be a little too expensive.
chrisjo Southward here: https://www.ebuy7.com/electric-track-toy-small-train-model-high-speed-rail-harmony-accessories-train-compartment-small-xu-bao-toys.html I don’t know anything about this vendor / marketplace.
Super I don’t know if this means anything but my Norton flagged this site and blocked it. It may be just on my computer but I thought I should say something so be careful.