as others said, you should buy the pure cannabinoids and make your own blend. you know what you are smoking and they are HELLA CHEAP. trust me I've smoked everyday for for months with 20 euros (assumed your tolerance is not really high)
you just have to dissolve the powder in acetone and spray it on an herb that will burn fine.
you should use pure acetone, but even acetone with water is fine, because when it dries (it will take alot more) the herb ou used will stick togheter and if you break it you will obtain something resembling buds. very cool.
look up the active dosage of your cannabinoid of choice and decide of much to use for how many grams
congratulations, now you've got your home made synthetic marijuana.
P.S. I STRONGLY suggest that instead of smoking your cannabinoids, you vape them (with a tinfoil or wathever, I find that a lightbulb works wonderfully). you use MUCH less and the high is somewhat smoother.