2) For some applications with low-current, it might make sense to install the TO-92 version of the LM317. Might be even cheaper depending on where you buy. The idea here is very few designs come anywhere near requiring the >1 Amp capability of the LM317T.
I did a fixed voltage version using the TO-92 chip.
It's less than an inch long and .3" wide. You can use any voltage three-terminal regulator in the board to pick a voltage. You can also stick the CL-2 constant current regulator in the board with no changes for a constant current application like LED lighting.