Wait a second... Did u say JB3??? Or did u mean jb4??? Because if u r talking old hardware that they probably don't make anymore.... I can see the justification to tell u to upgrade from old stuff to newer support products.
They probably buy this stuff in bulk to pass along savings to us, it doesn't mean we should expect them to supply legacy parts forever.... If the solution is to upgrade from JB3 --> JB4 G5, then that does make A LOT of sense to me.
Try asking microsoft to support u on windows xp, they won't because the product has been End Of Life already. Just eat some cup o noodles for a month to save up for the upgrade rather then getting your springs cut to get the lowered look
