naw, nothing super bad will happen. I sometimes go into my room during lights off, I don't use a flashlight, just use the reflected light from another room, but the result is about the same, it can stress the plants. I stressed one so bad once that I actually had to start over on week 1 of flower, this shouldn't be the case in your situation, just watch out for 'nanners' and peel them off if need be.

As far as $20 for clones, it looks like your doing pretty well already in a decently packed room - You sure you got space for 5 more? if you do, $100 for 5 clones isn't bad, but considering I can pull 1000 clones from a $6 seed... well (I'll let you do the math)

Up to you, but if you got room for it, and the spare cash, why not.