You can buy the oil and bake your own, but that requires more money and effort up front ($50-$100).
Vaping using concentrate is likewise not cheap.
And if you grow your own, you end up with plenty of "trim" (plant parts that aren't suited for smoking but still have lots of psychoactive ingredients). Most home growers will cook their trim with butter for a few hours, strain off the plant material, and use that to make edibles. It's not as scientific or consistent as the commercial methods, but it's easy and completely safe.
It doesn't require much money or effort at all. I regularly make small batches of oil using as little as 0.5g of kief.
I melt a little coconut oil, dump in the kief (would work with weed too, of course) and cover with tinfoil. Then I bake it at 115C/240F for 27 minutes - cannaoil, done!
THC is metabolised into a stronger form, THC-9-COOH, so edibles really make it go further. Plus the effects last several hours instead of the 1-2 when smoking or vaping.
> Vaping using concentrate is likewise not cheap.
Erm.. you don't have to use concentrates.