25 Holon Research Tower cards with current prices, from most to least expensive; the most valuable raw card is Umbreon Delta Species 069/086 ($410.26).
Umbreon Delta Species 069/086$410.26
Latias Delta Species 041/086$298.36
Rayquaza Delta Species 043/086$183.99
Flareon Delta Species 018/086$149.18
Salamence Delta Species 021/086$149.18
Dragonite Delta Species 039/086$119.34
Marowak Delta Species 058/086$89.50HHolons Electrode 032/086$69.62
Vaporeon Delta Species 030/086$59.67
Jolteon Delta Species 038/086$56.69
Latios Delta Species 042/086$49.72
Metagross Delta Species 040/086$49.72
Crobat Delta Species 011/086$39.77
Gardevoir Delta Species 050/086$29.83
Mightyena Delta Species 070/086$24.86
Beedrill Delta Species 010/086$19.88
Snow cloud Castform 027/086$16.91
Meowth 059/086$14.91
Starmie Delta Species 029/086$14.91
Sandslash Delta Species 057/086$6.97
Hypno 045/086$5.97
Dragonair Delta Species 035/086$5.47
Staryu 023/086$4.98HHolons Voltorb 031/086$3.98
Metang Delta Species 037/086$3.97