The first new thing we've found is the Jay Easy Wheelchair Cushion. Before we found this, my father had recurring pressure-ulcer problems on his left side (his weak side). His body tends to lean to the left, putting more and more pressure on the same spot. This wheechair cushion has a gel insert and conforms to the shape of the body. It's been a fabulous find.
There are many different prices, I've noticed, so take your time and search.