If you really want a good discount, you need to find out the shop that distribute to other small seller and befriend the tauke there. They have distributor price but they also do not want to spoil their relationship with reseller that order from them. In home appliances, they normally not just distributors but also seller. All they want is to hit target. They can probably give you reseller price 

I remember talked to one spare part shop on engine oil sold by Tesco. The boss told me that the price Tesco is selling is below their buying price, but they cannot but from Tesco because it will void agreement between him and the authorized supplier 

I used to be closed to one sales guy. He even showed me the purchase price, storage cost (i.e. estimated cost the appliances sit in the shop before being sold which include space and electricity cost. Basically operation cost) and the selling price to customer. So, they have discount range they can give. Seller got limit unless want to cut his commission. Else they can ask boss for more discount.

Once my brother wanted to buy a microwave oven similar like me and I told him the price I get. The shop he asked was selling higher price after asked for discount and the shop need to order because no stock. I told my brother to ask for more discount because it is a confirmed order. No additional cost like operation cost involved. At the end the shop gave my brother the price I told my brother to ask. 

That is one way of getting good price.