
1. Stick around here and post questions and reply until you can buy from here. Lots safer and possibly cheaper.
2. Don't know if you drive a car but you should look up to see if any coin shows in your area. Just try Google and coin shows and your state. Possibly the best place to buy any coins
3. Also, check if there are any coin clubs in your area. They too sometimes have coin shows.
4. Note the amount of coins Minted for those so called Key coins and remember that every day there are more and more coin collectors popping up. With well over 300,000,000 people in the USA, those Key coins will deminish in availability real soon
5. Either get to know fakes well or only buy slabbed, certified real coins for those last Key Dates in your set.
Don't worry about the grades of your coins. Since most are everyday types, our of circulation coins, no need to go nuts yet on trying to improve all of the rest for now.
Proofs too are usually available separately at coin shows.
If you can afford them, get those lousy expensive ones now since as I said, the amount of coin collectors is increasing fantastically lately due to the Mint's making all those dumb quarters.
And again be carefull of those 09S, 09S VDB and 14D ones since those are counterfeited as much as possible.
That 22 Plain too is available in several varieties and some are reasonably priced. For extensive infomation on those coins, try
http://www.coppercoins.com