looking for inexpensive speaker spikes?


I have an M&K sub with 1/4" x 20 thread holes for spiked feet. Can someone point me in a direction to find some new isolation feet / spikes in the $50-60 range?
The sub is sitting on carpet.
snipes
I have the M&K V-1250 sub on a carpet and have it on the
large Polycrystals which I found used on Audiogon. Works
great! Inexpensive.
If all else fails you could steal someone elses :) don't tell them I told you too though!! ~Tim
Anyone know the thread type for LINN Index? I bought mine used (no spikes). They are fixed to the stands, a little heavy and it would be a real hassle to take to the hardware store to find the right bolts to make some spikes.