I found them on amazon when I was looking for the those 1 time use toe warmers. These happened to come up in my search. I like the idea of using something more than one time. They're quite fantastic and aren't bulky at all. https://www.amazon.com/dp/B07963NW67?psc=1&ref=ppx\_yo2\_dt\_b\_product\_details
I’m also on the Sorel boot trend. They have lasted longer than my north face boots. Timberland socks are great. I also get toe covers which fit over socks which help, as well as warming lotion that can go on hands and feet. I also recommend a handheld rechargeable warmer. All found on Amazon:
21C 1.5mm Thermal Neoprene Toe... https://www.amazon.com/dp/B07963NW67?ref=ppx_pop_mob_ap_share
Warm Skin All Weather Guard -... https://www.amazon.com/dp/B0149L8ZP2?ref=ppx_pop_mob_ap_share
Unigear Hand Warmers... https://www.amazon.com/dp/B09F5GHYGB?ref=ppx_pop_mob_ap_share
Regular cardiovascular exercise helps by increasing peripheral blood flow, even at rest. Even if you don't have Raynaud's, some of the tips for it should help: https://www.stlukes-stl.com/health-content/medicine/33/000140.htm
Also, these are incredible and I wear them over my socks in the winter:
https://www.amazon.com/dp/B07963NW67/ref=cm_sw_r_cp_apa_fab_LPJAFbRDR1K7T