Let me tell you about a time I dealt with Superior Home Systems.
I saw "Central Vacuum Rough In Cover Plate White" listed on the site for $2.29. Went to the store to buy them and the shopkeeper said they only sold the covers to builders not home owners. Then the shopkeeper upsold Central Vacuum Inlet Covers to us for $10 a piece. At this point something fishy was afoot and should have left. The gut instinct was overridden and I bought them. Tried to screw them in at home, but the screw holes did not align, nor did they cover the entire hole in the wall. Went back to complain and now they handed over what we wanted originally , but would not be refunded the difference contrary to the no hassle return policy.
So in the end we got the covers, but paid 4x more than necessary.
Transaction happened Nov 29, 2013.