Concentrates & Extracts are available from licensed dispensaries in legal states. These concentrates can be up to 95% THC and are typically sold in a one-gram container. The retail price can vary from $30 for simple rosin and up to $90 for "solventless" rosin.
Related:
The different types of extracts and their extraction methods.
If you don't live in a legal state, you can purchase CBD dabs that are derived from hemp, so they are legal in all states.