13 Holon Research Tower Water Quarter Deck cards with current prices, from most to least expensive; the most valuable raw card is Ditto 002/015 ($100.51).
Ditto 002/015$100.51
Vaporeon ex 003/015$35.18
Eevee 007/015$18.09
Starmie Delta Species 005/015$8.04
Azumarill Delta Species 006/015$6.03
Master Ball 009/015$5.01
Holon Scientist 010/015$4.78
Marill 004/015$3.01
Basic Water Energy 012 015$3.00
Staryu 001/015$2.97
Holon Energy WP 015/015$2.51
Basic Water Energy 011 015$2.01
Potion 008/015$1.00