You're correct in that most reputable resin casters make stuff as they get orders because it does not pay for them to carry a lot of unsold inventory. My only experience has been with Modelhaus, Replicas & Miniatures Co. of MD, M.A.D., and Ed Fluck. With these resin casters, waiting awhile for your order is usually the norm, but well worth the wait due to the quality of their products. Yes, it can be frustrating to have to wait for months for something that you want "now", but that's just the nature of the beast. I just placed my "final" order with Modelhaus and I'm pretty sure I won't be receiving it until November or December, but they won't bill me for it until they ship it...... It'll be my Christmas present to myself .
Some of my favorite toys way-back-when...... The Fort Apache play set with the plastic snap-together fort walls, the tin cabin/bldg., and all the soldiers and Indians... I spent countless hours playing with that on the living room floor. A Fanner 50 pistol/revolver with 2 piece snap-together bullets...... I was always hunting around for the front piece of the bullets... A battery operated 30 Cal(?) machine gun on a tripod with a belt that fed white plastic bullets into the gun that would shoot out but not very far... I used to chase our Irish Setter dog around the house shooting the soft bullets at her...... she wound up getting me back by chewing up the bullets.