Contacted Homespare a month or so ago regarding this. There’s no quantity discounts at all, except on special offers. Had to phone my order through and they tried to match my previous prices, which they almost managed to do except I had to order £75 for free p&p. Worth a try though.
Yes, they seem to be up to the same tricks as Connect, such as pricing their pattern parts dearer than genuine. I ordered 2 individual CESET carbons, part No. 50266742001 as they worked out cheaper than a set of their own 4165. FHP Hotpoint carbons in holders are nearly twice the price at Homespare compared to Masterpart.