Why do you want to grade the coins... different reasons have different answers...
1/ Protection - you want to encapsulate the coin to protect it.
You have several options.
You can use an AirTite (plastic round capsule, despite the name they aren't airtight and the copper may continue to progress towards its brown color). Call it $3 per.
You can use 2x2 cardboard holders (the white things with the clear window and stapled or self-adhesive). These give some protection (flatten the staples so they don't scratch others) and can be stored fairly densely in a cardboard box, or in a binder page. Maybe 25c per or less. (There are 2x2 sized plastic snap-locks that fit in the boxes but are expensive)
Plastic flips - these are heat sealed on three sides forming a pair of 2x2 (or 2.5x2.5) compartments after you fold in the middle. You can put the coin in one side and a small card with data in the other. These too store in cardboard boxes or binder pages.
You can use a DIY plastic slab - many sellers on ebay or CoinWorld/Amos Advantage - these are not cheap but can be stored in a slab box (well, some slab boxes) with graded (
TPG) coins. Runs a couple of bucks per.
You can send them to a
TPG (Third Party Grader) who will verify authenticity, grade the coin, and seal it in a plastic slab (these aren;t airtight either). Most expensive. Call it $30/coin. ICG and ANACS are cheaper, NGC and PCGS are the most expensive.
2/ To sell. If you have coins that are commonly faked - key-date
Morgan dollars or Gold coins - the authenticity that comes from
TPG grading makes them easier to sell. Starts at that $30, but higher-valued coins need more insurance and have higher slabbing prices.
-----Burton
49 year / Life
ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, OnLine Coin Club
Owned by four cats and a wife of 39 years (joined 1983)
PS:
ANA's records are messed up, they show me as a 50-year member and I'm now Emeritus