Making it yourself is definitely much less expensive.
Keep in mind the following:
- Use only food-grade ethanol for best results
- Use clean olive oil, source oils that pass australian specifications for a start
- decarboxylate properly
I have a few videos on youtube (thecleangame decarboxylation) showing how to make canna-pills. The oil decarboxylation part is what you're interested in. Use a 200F temp oil bath instead of 245F, everything else is the same. :)