[New Grover Deluxe Tuners for ES-335]

Nice work--  Did the plugged holes from the Rotomatics line up with the new one required for the  Deluxe and you just plugged for a fresh start or was the new hole on body side located  slightly differently, forcing you to plug? 

[I have Gibson cs336 2002yr]

Sorry about your father - time takes all of us but Alzheimer's is a particularly tough one, saw it with my own mother.

Anyway, you can check pricing generally for most used models at Reverb.com. Take a look at this (just did a quick search for you, the results are here: https://reverb.com/marketplace?query=CS-336). Of course, asking price and selling price usually are not the same so if you check the sold listings only, the average price is at the lower end of the range quoted here. Anyway, that's how I get a sense of the price when I buy/sell. 

I have a 2006 356 which is one of my favorite guitars, so you should be able to sell yours easily if that is the route you decide. Good luck.

[How much does your 335 weigh?]

My 335 from the 90s (can't remember exactly,  would have to look it up), is 7lbs 14oz. Lighter than most it seems but noticeably heavier than my 339 and my CS-356.