If you are looking for affordable ways to add new products to your catalog, check out the free derives group.
http://www.imvu.com/groups/group/Free%2BDerivations/Some of the devs in that group offer full refunds of both the derive and submission fee for products.
FynnCasey has a number of rooms and furniture, he pays promptly. Every product needs a product specific icon and at least one picture on the product page.
There are several others in that group that do similar.
Also it is a good source for reasonably priced derivables, many that have only been derived a few times.
HitGirl