We noticed a need for reasonably priced grease/brake nipple caps when I was trying to finish the brake fluid replacement on my '76 BMW 2002.  This car has 8 brake bleed screws and I couldn't see paying up to $1.80 for each cap.  We found a manufacturer and obtained a number of caps which would suit the need.  In the process of working with the manufacturer we are developing a new product which will be more specifically suited for the bleed screws.  In the end we hope to have three or four products from this manufacturer available to DIY'ers at a reasonable price.  So far we have "advertised" on several marque specific user forums (benzworld, bimmerforums, BMW2002FAQ, etc.) and have mad several sales to fellow enthusiasts.