alternative to speaker stand spikes?

I understand sorbothane can be used. I use small squares that have some give and are sold at hardware (or home depot) stores and typically used under furniture. I also have hardwood floors. Hardwood floors can also be a bit uneven, so bumpers with give can help keep the speakers more level.

You can still use the spikes and protect your wood floors with ConeCoasters made by Sound Anchors (the guys who make speaker stands for B&W, etc.).

The coasters work great.

I am using Aurios [set of FOUR, for stability] under my speakers.

If you are cheap like me, try a nickel. If you are a big spender, you can use quarters. You can also paint them and put stick on furniture glides on the bottom which will allow you to slide the speakers slightly should you need to.

Another good alternative are spike footers. audio advisor is 1 source.