The Spade terminals are Monster Cable brand, and they don't require solder, plus they are reasonably cheap, AND I'm pretty sure they come in Spade, Banana, and Ring terminals.
The Ring terminals I used are low cost gold-plated audio, but you can buy common electrical ring (or spade) terminals at any hardware or building supply store. You just need to make sure that they will fit your speaker terminals. Mine are 5/16 inch which is what was required for my terminal posts. Other might be able to use 1/4 inch.
Steve/bluewizard