if the team is out of time outs and a player is injured can he buy back in wiht a technical. and if so who is the technical charged to or is it a team technical?

Yes, he can.

It's a team technical.

2002-2003 NFHS Basketball Rules Interpretations

Situation 6: In the last 30 seconds of a game, a player from each team has blood on the uniform. Team A has a time-out remaining and Team B does not. RULING: If the officials direct both players to leave the game, both teams must call a time-out to keep the respective players in the game. The player for Team B must leave the game since his/her team is out of time-outs. COMMENT: Team B could call an excessive time-out resulting in a technical foul to keep the player in the game.

And then they also get a time-out, right?

They get the 1 minute time out if they call it, regardless of whehter or not they actually have one. The only difference is the T and how the ball is put back into play.

Concurrent with Team A's Time-out.