Getting Kids Started

I got started partially due to wheat pennies.

Check out Google for possible coin shows in your area. Just type in coin shows and your state. Also, you may want to try coin clubs and do the same thing. At such places you could take your kids and they would be able to see all the varieties of coins, Albums, books on coins, etc. At such places you should be able to buy Proof coins at a substantial savings over ebay, other web sitesk coin stores. At 5 and 7 they would probably really get more info about coins at one show than all the other places such as ebay. And at a coin show, no postage, handling, insurances, lost in mail stories, etc.
Not sure what you mean by a Lincoln Cent BOOK. If it is a Folder type, you may want to stress to your kids to use cotton or something like that to push the coins into those slots. If an Album, same thing but less problems pushing the coins into their places. Have fun.

Thanks everyone. I can't find any local coin dealers. I have found a few pawn shops that take coins(only silver/gold) but will not sell them. Checked for local coin shows and none anytime soon. I guess these wont be all that expensive from ebay and should be easy to find.

Definitely take them to the next coin show in your area. Shows almost invariably have YN (young numismatists) tables, and sometimes offer free goodies, such as supplies and even coin raffles. It's also a good way to see many different kinds of coins at once. Dealers I bought from always managed to give a freebie of some sort to my kids when I brought them. It's good for business and called seeding the next generation, and yep, they both still collect today. One does classic graded US from 1907-36, the other dabbles in gold and platinum. Puts the old man to shame, who only buys silver!

I was afraid of that. If you stick around here eventually you'll read all the goods and bads about Folders versus Albums. However at those age groups of your kids, those Folders are good enough just in case they loose interest.
Not sure what state you live in but when searching for coin shows, you may want to also try a state near you just in case you live near other states. And as before, also try for local coin clubs. If there are any, many of them also have great things of kids. You also may want to check out flea markets. By me one flea market has a seller that always sell proof coins.