Radio Shack doesn't carry either of those. The closes they have for a distribution block is one designed for phone. However all a distribution block is is a place where you can easily tied a bunch of common wires together, so if you really don't want to order from Bob, just try one of those, and use forked (or U or C or whatever you want to call them) connectors on your cable ends.
As for the AC filter, Radios shack has one, but it would take some hacking on as well to use (it's designed to plug into a wall outlet, and then plug another 3 prong device into).
Of course you'll end up paying a lot more than just ordering from Bob.
In the end, you really can't beat Bob Roberts.