There's loads of 'legal highs' that work, nothing's like herb except herb though. Its an area that requires research, man, it's not a good idea to take any drug without first knowing everything you can about it. I suggest if there's a product you like the look of, take a note of the name of the plant, then look it up on google, or check out erowid. Any product that doesn't actually reveal the name of the plant/plants is a scam and can be ignored. Once you've established what the plant does, take a look for other places selling it, cos most of the stuff on sale by all these 'legal high' merchants can be bought for a fraction of the cost elsewhere. As a starter for you, Wild Lettuce (Lactuca Virola) is quite a nice buzz if you can get it in resin form (not worth getting leaf, you need to smoke about an oz for any effect) - it's kinda like a very mild opium hit (another name for the plant is lettuce opium).
Do a bit of research dude, half the fun of plant-based psychedelics is the discovery.