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You have run into the big gotcha of the Borg and similar stores- they stock based on 80/20 rule (80% of sales are for the same 20% of items), so there is little money in stocking the oddball stuff. You probably want to try a real lumberyard or trim mill, the kind that is in the nasty part of town, not in an asphalt lake, and only open M-F 7-4 and maybe till noon on Sat, since that is when their customers, working tradesmen, do their shopping. Unless you can dig up the make and model of your door, it'll help to take the old door slab in, and just tell them you need to match it. Worst case scenario- they have to special order what you need from a door company. But unlike the Borg, they will know how to do it.
aem sends....