I seem to be stuck in an endless loop with LCSC.  I want to order a significant percentage of the board components and have them delivered with the PCBs to save shipping costs.  But LCSC never seem to have all the components in stock, and by the time they quote 48 hours later (or more !) a date for when they will be in stock, something else is out of stock.  RS have a system in place to allow for this but I can't seem to find the same with LCSC.  If they could just reserve the components they do have until the out of stock ones re-appear it would help a lot. Any advice ?  (Other than don't use obscure common components)