I think you are pretty close although I just sold a 1oz ox on ebay for about $66 and a tiger for $67 starting at .99 , but I have sold the tiger for about 100. it can be really random but I think the dragon has affected the rest of the market..
I don't think the Ox is valued at $90-100 at the moment. I have been offering ox rolls for $80/coin for some time and while many people are interested in trading, very few are interested in buying them...
I reckon as of today. Mouse $45 Ox $70-$75 Tiger $70 Rabbit $50 Dragon $60 Are the current market prices.
I was quoting if you wanted to buy a single coin. Typically you can get a bit better deal buying a roll etc.