Well, the Jamaican sold by Katsu and Bluebird, and Thai from Katsu and Stone's Corner around 2013 - 15 were nowhere near 11% THC. I estimate the Thai to be under 5% THC, Jamaican even weaker. No visuals, no psychedelia and you barely felt the effect.
I've seen some shops selling Thai for around 7-8 euros per gram, but i have never tried it, so maybe this thai is stronger. But i doubt you can find it for 3-4 euros per gram as the weak brick i smoked during few visits.
€6.50 per gram.