Turntable mat for Sony PS-x6

Thanks for all the suggestions. I decided to splurge and bought a SPEC+Analog Disc Stabilizer. I've also just bought a fully cleaned and refurbished Sony PS-x50 turntable that does have an adjustable arm height. I've read really good reviews about the SPEC+. If I don't like it I can return it. 

I use a rubber mat under a gunmetal mat.   Best combo so far

The platter on the PS-X6 rings like a bell. The arm height is not too adjustable which may limit what the options are. To damp the platter you may want to try a 2mm brass mat from doukmall then add a thin rubber mat on top of it. The brass will damp the aluminum platter very well. Getting both should be doable for under your budget. 

Thanks for the responses so far. I’m definitely going to try an aftermarket mat. 

You'll get as many different opinions as responses. I use Boston Audio graphite mats and also the SAEC SS300 metal mat, with good results on DD turntables like your PSX6. Anyway, you have the right idea about replacing the original mat, if it's the typical rubber used on Japanese TTs in the 70s and 80s,

Funk Firm Achromat 5mm.