If in the US buy the ephedrine. In my opinion the ideal appetite suppressant/energizer/thermogenic.
I see some US "research chemical" places sell albuterol, like "Amino Asylum." It can be a good replacement for clen.
If you don't care about addiction, nicotine gum can be a very decent thermogenic.
Another potent OTC drug is yohimbine. Warning: if never used try just 2.5mg to start. Some feel horrible on it.
For a quick crash diet scenario for quick results for say a special date, a combo of caffeine + ephedrine (or albuterol) + yohimbine + nicotine would be the bomb but will have some risk and cause side effects. Optional: anabolic steroids and GH to stave off any muscle loss. Add a PSMF diet, with maybe a carb load for sanity every now and then and you will lose as fast as you can.