Frustrating with out of stock items

I have a very big concern regarding Homechoice's pricing system. Prices are not consistent in their October 2015 catalogue and their online shopping site. I want to order the 14 piece Aliya luxury comforter set, but it seems that this item is out of stock (like so many others). What worries me is the fact that the price for this set is indicated as R2,899 in the catalogue, but online it's indicated as R2,599. The 5 piece reversible cream curtain set is indicated in the catalogue as R749, but online it's indicated as R699. Another concern: Payments over 6 months have interest added. Why is this, because when you buy items over a 6 month period, it should be regarded as cash. Another concern: Why doesn't this service provider keep more stock of the items that are popular choices rather than running out of stock and having to inform the buying public about no stock online? This doesn't give a good image of Homechoice's business. I wanted to buy the Cara set first, but then had to see that it was also not in stock. Not good.