I used to purchase it from tRNA Probes in Texas but they went out of business. Sigma no longer sells it either. I've gone through page after page on Google, to no avail. I did find a company called "Chemical Block" but it looks sketchy, is in Russia, and they only accept Paypal, which my lab won't do.
Is there any company left that sells homogeneous tRNA, such as lysine-tRNA? It can be the tRNA by itself or already charged with lysine.