Well let's see here, for Goku Kagero...
Grade 0's
4 Gattling Claw Dragon (Draw Trigger) - Kagero Trial Deck
4 Embodiment of Spear, Tahr (Critical Trigger) - Kagero Trial Deck
4 Demonic Dragon Mage, Rakshasa (Critical Trigger) - Kagero Trial Deck
4 Dragon Monk, Genjo (Heal Trigger) - Kagero Trial Deck
1 Lizard Soldier, Conroe (Starting Vanguard) - $4-5 a piece
Grade 1's
4 Wyvern Guard, Barri (Perfect Guard) - $20+ a piece
4 Demonic Dragon Mage, Kimnara - $3-4 a piece
4 Embodiment of Armor, Bahr - Kagero Trial Deck
2 Flame of Hope, Aermo - Kagero Trial Deck
Grade 2's
4 Berserk Dragon - Kagero Trial Deck
4 Chain-attack Sutherland - $1-2 a piece
2 Dragon Knight, Nehalem - Kagero Trial Deck
1 Wyvern Strike, Tejas - Kagero Trial Deck
Grade 3's
4 Dragon Monk, Goku - $7-10 a piece
4 Dragonic Overlord - Kagero Trial Deck
Deck Total (50)
The cards I have listed under Kagero Trial Deck you can get inside the Trial Deck but you'll want to buy 2 of the same Trial Decks to double what you need out of them which is like $15-20 per deck. The Perfect Guards make the deck expensive but you could run replacements instead.
As for Oracle Think Tank, here's a decklist of it:
Grade 0's
4 Dream Eater (Draw Trigger) - $1.48 a playset
2 Miracle Kid (Draw Trigger) - $0.99 for 2 (I think)
4 Psychic Bird (Critical Trigger) - $1.48 a playset
2 Oracle Guardian, Nike (Critical Trigger) - $0.99 for 2?
4 Lozenge Magus (Heal Trigger/Starting Vanguard) - $7-10 a playset
Grade 1's
4 Battle Sister, Chocolat (Perfect Guard) - $15-20 a piece
4 Battle Sister, Cocoa - $7-10 a piece
4 Oracle Guardian, Gemini - $1.48 a playset
3 Luck Bird - $2.36 a piece?
Grade 2's
4 Silent Tom - $20+ a piece
4 Maiden of Libra - $10+ a playset
Grade 3's
4 Oracle Guardian, Apollon - $3.00 a playset
4 CEO Amaterasu - $25-30 a playset
Deck Total (50)
You're getting a much better deal on Goku Kagero than you are on the CEO Amaterasu/Silent Tom OTT deck. Running the Tsukiyomi Ride Chain strategy might drop the price of the deck down a bit but it's still going to be more expensive than Kagero though. Royal Paladins used to be pretty expensive before Barcgal got Restricted from being Starting Vanguard, it's still a good clan and will get better in BT05 with Majesty Lord Blaster.
One of my friends offered to sell me his Spike Brothers deck for $40 cause he already runs 3 decks being Lawkeeper Kagero, Spectral Duke Gold Paladins, and Dark Irregulars. I turned down the offer because I didn't know for sure If Cardfight!! Vanguard will last long as a TCG compared to Yu-Gi-Oh!, Magic, and Pokemon. What If by some chance that Vanguard dies out next year and Yu-Gi-Oh! and other more established TCG's are still on top? See what I'm saying? I'm already treading on thin ice.