I wonder if this is similar to one of my local LSB's (I am blessed with four, plus another in the next town). They recently shut down on weekends and said they were going to "focus on sales and service." I haven't gone in to buy parts since they changed format, since the shop a mile up the road from them is still open on weekends. I strongly suspect your shop is merely pumping for profits. I recall TV repair shops refusing to sell parts because of the small profit margins involved. That was never a problem back in the days when we had lots of electronics parts stores.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069