You can buy them there, at the gate.
" Just down the street from the Heian Shrine, the Taikan-ten is held in the Kyoto International Exhibition Hall, aka Miyako Messe, in the Okazaki area of eastern Kyoto. The admission price is ¥800 (currently about 7.23 USD or 6.37 Euro)."
Follow this link:
www.magiminiland.org/Taikan-ten.html