I'm going to echo a lot of what thetimewarptrio said.
Fellowship draft is A LOT of fun, but it will cost you a little more just because of Realms of The Elf Lords. There's just something special and nostalgic about the feeling of opening those FotR packs and making a deck with a FotR site path
I've spent a lot of time buying/selling/playing with cards recently, and am planning on trying for a local sealed tournament myself soon.
I'll give you a cost breakdown based on the average prices I've seen throughout eBay and online dealers like catergoryonegames and miniaturemarket, etc (not including shipping charges...the people who offer free shipping generally use a "buy it now" price for more). Sometimes you can snag them for cheaper on eBay if someone doesn't name the auction correctly, and it doesn't get a lot of views, but you can't really count on that too often hehe.
Fellowship Block Booster Boxes:
FotR: $30
Mines of Moria: $16
Realms of the Elf Lords: $75-$80
Towers Block Booster Boxes:
TT: $27
Battle of Helm's Deep: $30-$35
Ents of Fangorn: $22 <--these have recently gotten a little higher in demand from what I've seen
So totaling the three boxes...
FotR: $121-$126
TT: $79-$84
You'll notice on eBay, that most of the time, the "Buy It Now" prices are quite a bit more than this, and people sometimes
do purchase them for that price. The prices I listed are what I consider to be the "fair" price, or what I would sell it for.
As was already mentioned, the actual draft packs usually cost only about 10 bucks for FotR, while Towers can run up to $20 from what I've seen (they're a little harder to find).
If I had to guess, you could plan on spending around $30 - $40 more if you chose Fellowship over Towers...for me, the price is worth it for the experience, but to each his own
I'm currently seeing if I can get my friend to offload some booster boxes to me; he had plans but probably won't use them. He does have some Realms, and I'm eager to get my hands on them. If I get more than one, I'll be posting extras on my sale of sealed stuff on the Esgaroth Marketplace, I need to update that thread anyway.
In any case, good luck and let us know how the planning goes! I'll give you a heads up when I update my sales thread, if you end up being interested.