Going to have to say perhaps invest in a little grow room and experiment growing your own bud.
I'm assuming you would like your weed to last a little longer? Grow a stronger strain, and enjoy it don't whore it down It's a matter of time before you'll be looking for stronger stuff, so may as well check out some seed banks and you know...
Theres this stuff called Salvia Ive never tried. I've heard mixed reviews. Some people had really really bad trips on it. But given a youtube video I saw of a kid taking Salvia - It does not look like good safe shit. It doesnt seem to act like marijauna. And who knows, years from now we can find out it makes your balls rot off.
Better play it safe and see your local greenthumb.