I was going to buy some marinated button mushrooms while at the store
awhile ago. But they were outrageously expensive ($6.49 for a small
10 oz jar).

I would really like to try and marinate some fresh ones. . .I've tried
it a bit in the past, but the mushrooms always turned a gray/brownish
color, fairly quickly.

Does anyone know a process for marinating mushrooms, that works pretty
well for them?

Myrl Jeffcoat
http://www.myrljeffcoat.com