well dude if you want to make homemade ones this is how you do it

1. Go to Wal-Mart or Bass Pro shops and get the Thill Nite Brite brand Bobber Light replacements. They're like around $2 or $3 each.

2. Take your nocks and get 2 drill bits. The first bit will be a 5/64 and the second will be a 5/32. Use the 5/64 to drill a hole from the insert part of your nock through the bottom of the fork in the nock. Try to center this hole as best as you can. This way when you release the arrow you will clearly see the "tracer" that follows. You can drill it out a little bigger but I suggest keeping it as small as possible so it's easier to track and not so blinding.

3. Next take the 5/32 and drill a short way up the insert part of the nock. Do NOT drill all the way to the end of the nock since this is the part that will hold the Thill Light in the Nock. Actually, you only want to drill about to where the line on the Nock will physically have the same outside diameter as your arrow so a little over 5/16 of an inch to 3/8 of an inch.

4. Insert the Nite Brite Light in the end of the Nock, It will turn on and this is not a problem since you want to get it in there as far as possible, so when you shoot the inertia and kinetic energy won't knock it out of the nock and down the shaft of the arrow to your tips.

5. To turn it off simply pull gently like you're trying to pull the battery our of the nock and it'll go out, if not you may have to wiggle it from side to side a little and it will go out.

You can make 3 of these for the same price as the Lume-Nock brand nock and these things have like a 24 hour burn rate on them so you just turn them on when you need them and off when you store them and you're good to go