The .tm extension was actually available approx 5 years ago - but the demand for the names at that time was so high that the registrar in charge could not keep up - and they eventually shut down. The extension was off the market for 4 years until it was relaunched not too long ago - with a new (supposedly) beefed up registrar.
I can get you a $99 year rate at eNom - which will save you a lot of money - but that's still going to be a $990 registration. I also have compiled a list of available key words that would make your heart pound - but at 1K a pop it's a tough sell.
Forget about reselling them - but if you are looking to develop and have some extra cash lying around - maybe it's a risk you are willing to take. Anyway - don't pay over $99 per year ($990 total) and make your cost even worse. If you decide to grab one - I can get it for you at the lowest rate - and push to your account. I won't make any money on the deal - and I don't mind helping you out - but I would of course need some type of guarantee that you are going to pay me for it.
Good luck with your decision. Hopefully you can find a cheaper alternative!