I have bought some slabbed coins but I keep them away from my trays (obvious reason)I always buy the coin and not the grade. I can't fault PCGS or NGC on grading I have MS63 to 65 and all of them are spanking coins.
One of the coins the Chinese produce is the 1822 crown. I was looking at the Alibaba.com site the other day. There was an actual thread on Coincommunity recently.
I always start with a Ricard and a dozen oysters. After my 5th course Mrs Peter rolls me home/back to the gite/hotel. I do like France...yes I have said it.
I bought my acetone from ebay. Use a cotton bud on tarnished areas if you are not happy with the coin.Rinse and pat dry. Best to experiment on some junk coins. Don't clean your 6d...looks nice.
I do like getting value. We have started using Aldi for shopping.The quality is good especially for fruit and veg. Same with coins I shop around. It is part of the enjoyment.