First off by spice i assume your refereing to DMT? I recently tryed Salvia, 5X and it was quite something. If your looking for a weed like high then neither salvia or dmt are what your looking for but if your looking to really trip out but not for long periods of time like psilocybins or lsd would provide then i recomend salvia or dmt. As for the people that didnt think salvia was that good, chances are that you werent smokeing it properly either that or you were smokeing leaf not extract and you werent smokeing enough, dosage for salvia extract is much lower than leaf. For best effects, a torch lighter would be benificial since its flame burns hotter and the active chemical Salvinorum-A is released at a higher temperature than THC. Also hold in the smoke for as long as possible so that you absorb it all. As for price, i can find 20X for like $30 here (canadian dollars) chances are it depends who you go through.