Try eBay
<span style="font-family: verdana,geneva;">They have a number of auctions out there that might fit your needs. I just had to replace the stem on mine and found it on Amazon which is another source. My FP is about 20 years old so I was surprised to find the part on Amazon.</span>
<span style="font-family: verdana,geneva;">One of those two sources may be a good place to start.</span>